Continuity of Operations Plan
Encyclopedia
Continuity of Operations (COOP) is a United States Federal initiative, required by Presidential directive, to ensure that agencies are able to continue performance of essential functions under a broad range of circumstances.

National Security Presidential Directive-51 (NSPD-51)/Homeland Security Presidential Directive-20 (HSPD-20), National Continuity Policy, specifies certain requirements for continuity plan development, including the requirement that all Federal executive branch departments and agencies develop an integrated, overlapping continuity capability. FCD 1 also serves as guidance to State, local, and tribal governments.

FEMA has developed Continuity Guidance Circular 1, Continuity Guidance for Non-Federal Agencies (CGC 1). CGC 1 parallels the information in FCD 1 closely, but is geared to States, territories, tribal and local governments, and private-sector organizations .

History

A Continuity of Operations Plan (or Continuity of Government
Continuity of government
Continuity of government is the principle of establishing defined procedures that allow a government to continue its essential operations in case of nuclear war or other catastrophic event....

 Plan) has been a part of government operations since at least the Cold War
Cold War
The Cold War was the continuing state from roughly 1946 to 1991 of political conflict, military tension, proxy wars, and economic competition between the Communist World—primarily the Soviet Union and its satellite states and allies—and the powers of the Western world, primarily the United States...

, when President
President of the United States
The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

 Dwight D. Eisenhower
Dwight D. Eisenhower
Dwight David "Ike" Eisenhower was the 34th President of the United States, from 1953 until 1961. He was a five-star general in the United States Army...

 provided (via executive order) various measures designed to ensure that the government of the United States would be able to continue operating after a nuclear war
Nuclear warfare
Nuclear warfare, or atomic warfare, is a military conflict or political strategy in which nuclear weaponry is detonated on an opponent. Compared to conventional warfare, nuclear warfare can be vastly more destructive in range and extent of damage...

. These plans were classified for many years, partly under the assumption that knowledge of these plans would enable the Soviet Union to more effectively launch a nuclear attack. In addition, these plans were censored to prevent an uproar among the American public, who (proponents feared) might panic after the revelation that the government was planning for its own survival in a terrifying post-nuclear war environment. With the fall of the Berlin Wall
Berlin Wall
The Berlin Wall was a barrier constructed by the German Democratic Republic starting on 13 August 1961, that completely cut off West Berlin from surrounding East Germany and from East Berlin...

, these plans lost their prominence both in government and in the public consciousness. The Continuity of Operations Plan has seen a return to relevance in the 2000s. After the September 11 attacks, many speculated that terrorists might attempt to destroy a large part of the central government and send the country into chaos. Much of the government's plans for post-nuclear war survival remain secret, and some of the measures that are known are controversial.

These measures included construction of underground facilities such as "Mount Weather
Mount Weather
The Mount Weather Emergency Operations Center is a civilian command facility in Virginia, U.S. used as the center of operations for the Federal Emergency Management Agency...

", a hollowed-out putatively nuclear-proof mountain in western Virginia
Virginia
The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

 with a mailing address in Berryville, Virginia
Berryville, Virginia
Berryville is an incorporated town in and the county seat of Clarke County, Virginia, United States. The population was 2,963 at the 2000 census.-Geography:...

. The public can now tour one such facility, intended to house the entire United States Congress
United States Congress
The United States Congress is the bicameral legislature of the federal government of the United States, consisting of the Senate and the House of Representatives. The Congress meets in the United States Capitol in Washington, D.C....

, on the grounds of the Greenbrier Resort in White Sulphur Springs, West Virginia
White Sulphur Springs, West Virginia
White Sulphur Springs is a city in Greenbrier County, West Virginia, United States. The population was 2,444 at the 2010 census.-Geography:White Sulphur Springs is located at ....

. Other provisions of the plans included executive orders that designated certain government officials to assume Cabinet
United States Cabinet
The Cabinet of the United States is composed of the most senior appointed officers of the executive branch of the federal government of the United States, which are generally the heads of the federal executive departments...

 and other executive branch positions and carry out the responsibilities of the position if the primary office holders are killed. There has been a formal line of succession
United States presidential line of succession
The United States presidential line of succession defines who may become or act as President of the United States upon the incapacity, death, resignation, or removal from office of a sitting president or a president-elect.- Current order :This is a list of the current presidential line of...

 to the presidency since 1792 (currently found in the Presidential Succession Act
Presidential Succession Act
The Presidential Succession Act establishes the line of succession to the powers and duties of the office of President of the United States in the event that neither a President nor Vice President is able to "discharge the powers and duties of the office." The current Presidential Succession Act...

 of 1947). This runs from the Vice President to the Speaker of the House of Representatives
Speaker of the United States House of Representatives
The Speaker of the United States House of Representatives, or Speaker of the House, is the presiding officer of the United States House of Representatives...

, President pro tempore of the Senate
President pro tempore of the United States Senate
The President pro tempore is the second-highest-ranking official of the United States Senate. The United States Constitution states that the Vice President of the United States is the President of the Senate and the highest-ranking official of the Senate despite not being a member of the body...

, and then through the Cabinet secretaries in a sequence specified by Congress.

Continuity of government plans are not limited to the federal government. The majority of states have constitutional provisions that provide for the succession of government in the event of an "enemy attack."

COG activated

The George W. Bush administration put the Continuity of Operations plan into effect for the first time directly following the September 11 attacks. Their implementation involved a rotating staff of 75 to 150 senior officials and other government workers from every federal executive department
United States Federal Executive Departments
The United States federal executive departments are among the oldest primary units of the executive branch of the federal government of the United States—the Departments of State, War, and the Treasury all being established within a few weeks of each other in 1789.Federal executive...

 and other parts of the executive branch in two secure bunkers on the East Coast
East Coast of the United States
The East Coast of the United States, also known as the Eastern Seaboard, refers to the easternmost coastal states in the United States, which touch the Atlantic Ocean and stretch up to Canada. The term includes the U.S...

. Friends, family and co-workers were only able to reach them through a toll-free number and personal extensions.
The Bush administration did not acknowledge the implementation of the COG plan until March 1, 2002.

Since September 11, 2001, the newly created Department of Homeland Security
United States Department of Homeland Security
The United States Department of Homeland Security is a cabinet department of the United States federal government, created in response to the September 11 attacks, and with the primary responsibilities of protecting the territory of the United States and protectorates from and responding to...

 has conducted at least three exercises to test continuity plans. The first, named "Forward Challenge '04", took place from May 12 to May 13, 2004, and included more than 40 government agencies. The second major exercise took place from June 20 to June 24, 2005. Titled "Pinnacle", the exercise tested responses to various emergencies, including a hypothetical act of terrorism
Terrorism
Terrorism is the systematic use of terror, especially as a means of coercion. In the international community, however, terrorism has no universally agreed, legally binding, criminal law definition...

. "Forward Challenge
Forward Challenge
Forward Challenge 06 was an exercise in crisis operations and continuity of government operation conducted by the Federal Emergency Management Agency and other agencies in June 2006. The exercise included activities at Mount Weather in Virginia....

 '06" was the third major exercise, and took place on June 19, 2006. It reportedly involved nearly 4,000 government personnel.

In September 2010, President Barack Obama
Barack Obama
Barack Hussein Obama II is the 44th and current President of the United States. He is the first African American to hold the office. Obama previously served as a United States Senator from Illinois, from January 2005 until he resigned following his victory in the 2008 presidential election.Born in...

 informed Congress that the State of Emergency
State of emergency
A state of emergency is a governmental declaration that may suspend some normal functions of the executive, legislative and judicial powers, alert citizens to change their normal behaviours, or order government agencies to implement emergency preparedness plans. It can also be used as a rationale...

 in effect since September 14, 2001, will be extended another year. The National Emergencies Act
National Emergencies Act
The National Emergencies Act is a United States federal law passed in 1976 to stop open-ended states of national emergency and formalize the power of Congress to provide certain checks and balances on the emergency powers of the President. The act sets a limit of two years on states of national...

 grants various powers to the president during times of emergency, and was intended to prevent a president from declaring a state of emergency of indefinite duration.

In 2007, Professor Larry J. Sabato criticized the incomplete nature of the plan in his book A More Perfect Constitution
A More Perfect Constitution
A More Perfect Constitution is a non-fiction book by American political scientist Larry J. Sabato, published in 2007. In it, Sabato calls for a new constitutional convention to update the United States Constitution....

. In particular, he objected to the fact that there is no Constitutional procedure for replacing U.S. House members in the case of a large-scale attack which could potentially kill a large number of representatives. In regard to the Continuity of Operations Plan, Sabato said it "failed outright" during the September 11 attacks.

The NORAD- and USNORTHCOM-sponsored exercise "Vigilant Shield 2008" took place from October 15 to October 20, 2007.

Lack of Congressional oversight

On July 18, 2007, Rep. Peter DeFazio
Peter DeFazio
Peter Anthony DeFazio is the U.S. Representative for , serving since 1987. He is a member of the Democratic Party. The district includes Eugene, Springfield, Roseburg and part of Corvallis. As Oregon's most senior member of Congress, he is the dean of Oregon's House of Representatives delegation...

 (D-OR), a member of the U.S. House Committee on Homeland Security, requested the classified and more detailed version of the government's continuity of government plan in a letter signed by him and the chairperson of the House Homeland Committee, which is supposed to have access to confidential government information. The president refused to provide the information, to the surprise of the congressional committee. , efforts by the committee to secure a copy of the plan continue.

George W. Bush administration

  • NSPD 51 National Security Presidential Directive 51, "National Continuity Policy", May 9, 2007 (supersedes Presidential Decision Directive 67) (also known as HSPD 20 "Homeland Security Presidential Directive 20")

Clinton administration

  • Federal Preparedness Circular 65, "Federal Executive Branch Continuity of Operations (COOP)", July 26, 1999
  • "Federal Response Plan" [FEMA 9230.1-PL], April 1999
  • Presidential Decision Directive 67, "Enduring Constitutional Government and Continuity of Government Operations", October 21, 1998
  • 41 Code of Federal Regulations 101-2, "Occupant Emergency Program", revised as of July 1, 1998
  • 36 Code of Federal Regulations 1236, "Management of Vital Records", revised as of July 1, 1998
  • Presidential Decision Directive 63, "Critical Infrastructure Protection (CIP)", May 22, 1998
  • Presidential Decision Directive 62, "Protection Against Unconventional Threats to the Homeland and Americans Overseas", May 22, 1998
  • FPC 65 Federal Response Planning Guidance 01-94, "Continuity of Operations (COOP)", December 4, 1994

George H. W. Bush administration

  • PDD 67 National Security Directive 69, "Enduring Constitutional Government", June 2, 1992
  • FPC 65 Federal Preparedness Circular 61, "Emergency Succession to Key Positions of the Federal Departments and Agencies", August 2, 1991
  • FPC 65 Federal Preparedness Circular 62, "Delegation of Authorities for Emergency Situations", August 1, 1991
  • Federal Preparedness Circular 60, "Continuity of the Executive Branch of the Federal Government at the Headquarters Level During National Security Emergencies", November 20, 1990
  • NSD 69 National Security Directive 37, "Enduring Constitutional Government", April 18, 1990

Reagan administration

An unknown contingency plan (which some believe was Rex 84
Rex 84
Rex 84, short for Readiness Exercise 1984, was a secretive "scenario and drill" developed by the United States federal government to suspend the United States Constitution, declare martial law, place military commanders in charge of state and local governments, and detain large numbers of American...

) was publicly mentioned during the Iran-Contra Hearings in 1987.
Transcripts from the hearing in the New York Times record the following dialogue between Congressman Jack Brooks, North's attorney Brendan Sullivan and Senator Daniel Inouye, the Democratic Chair of the Committee:
, "Assignment of Emergency Preparedness Responsibilities", November 18, 1988

Section 202

The head of each Federal department and agency shall ensure the continuity of essential functions in any national security emergency by providing for: succession to office and emergency delegation of authority in accordance with applicable law; safekeeping of essential resources, facilities, and records; and establishment of emergency operating capabilities.
, "Assignment of National Security and Emergency Preparedness Telecommunications Functions", April 3, 1984
  • NSD 69 NSDD 55, "Enduring National Leadership" September 14, 1982

Carter administration

  • Executive Order 12148
    Executive Order 12148
    Executive Order 12148 was an executive order enacted by President Jimmy Carter on July 20, 1979 to transfer and reassign duties to the newly formed agency, known as the Federal Emergency Management Agency , created by...

    , "Federal Emergency Management", July 20, 1979

Hardware and facilities

The Continuity of Operations Plan involves numerous bunker
Bunker
A military bunker is a hardened shelter, often buried partly or fully underground, designed to protect the inhabitants from falling bombs or other attacks...

s, special airplanes, and communication systems. Much of the information about them is classified, however information on various systems has been released by the government or described to the public by reporters and writers. Since many of the details are classified, the public information may be incorrect. Also they are subject to change without public notice so this list may not reflect current plans.

Facilities

During the Cold War, the United States constructed bunkers to help provide survivability to military command and government officials. Some have been decommissioned since the Cold War. The ones that are still considered to be in operation are listed here.
  • Cheyenne Mountain
    Cheyenne Mountain
    Cheyenne Mountain is a mountain located just outside the southwest side of Colorado Springs, Colorado, U.S., and is home to the Cheyenne Mountain Air Force Station and its Cheyenne Mountain Directorate, formerly known as the Cheyenne Mountain Operations Center .Throughout the Cold War and...

     Directorate - This bunker is the former home of NORAD. Becoming fully operational on April 20, 1966, it is located in Colorado Springs, Colorado
    Colorado Springs, Colorado
    Colorado Springs is a Home Rule Municipality that is the county seat and most populous city of El Paso County, Colorado, United States. Colorado Springs is located in South-Central Colorado, in the southern portion of the state. It is situated on Fountain Creek and is located south of the Colorado...

    . Currently, the military has the goal of placing the operations center on "warm stand-by", meaning that the facility will be maintained and ready for use on short notice as necessary, but not used on a daily basis. In the event of an emergency deemed serious enough, NORAD and USNORTHCOM would use the bunker for C4ISTAR
    C4ISTAR
    In military usage, a number of abbreviations in the format C followed by additional letters are used, based on expanded versions of the abbreviation C2 - command and control.C2I stands for command, control, and intelligence....

     of America's military.
  • Site R (Raven Rock) - Near Waynesboro, Pennsylvania
    Waynesboro, Pennsylvania
    Waynesboro is a borough in Franklin County, Pennsylvania, located northwest of Baltimore, Maryland, 67 miles southwest of Harrisburg, Pennsylvania, and north of the Mason-Dixon Line. The population within the borough limits was 9,614 at the 2000 census. When combined with the surrounding...

    , Site R is the emergency home for The Pentagon
    The Pentagon
    The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia. As a symbol of the U.S. military, "the Pentagon" is often used metonymically to refer to the Department of Defense rather than the building itself.Designed by the American architect...

    . Vice President Cheney is reported to have stayed here after the September 11 attacks.
  • Mount Weather - The Mount Weather Emergency Operations Center is a government facility located near Bluemont, Virginia
    Bluemont, Virginia
    Bluemont is an unincorporated village in Loudoun County, Virginia located at the base of Snickers Gap in the Blue Ridge Mountain. At 680 feet , it is the highest community in Loudoun County...

    . It houses operations and training facilities above ground for the Federal Emergency Management Agency
    Federal Emergency Management Agency
    The Federal Emergency Management Agency is an agency of the United States Department of Homeland Security, initially created by Presidential Reorganization Plan No. 1 of 1978 and implemented by two Executive Orders...

     (FEMA) and contains an underground facility designed to house key components of the American government in the case of nuclear war. During the September 11 attacks, a line of government cars and limousines with police escort was seen heading from Washington, D.C.
    Washington, D.C.
    Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

     to Mount Weather. It has been suggested that Vice President Dick Cheney has been at Mount Weather from time to time, as it is the quintessential "secure undisclosed location". Since September 11, 2001, Mount Weather has seen a dramatic increase in staffing and support. It is believed that Mount Weather has largely assumed the functions of the facility at the Greenbrier, which was to house the U.S. Congress
    United States Congress
    The United States Congress is the bicameral legislature of the federal government of the United States, consisting of the Senate and the House of Representatives. The Congress meets in the United States Capitol in Washington, D.C....

     in an emergency, since that shelter was decommissioned.

Airplanes

  • Air Force One
    Air Force One
    Air Force One is the official air traffic control call sign of any United States Air Force aircraft carrying the President of the United States. In common parlance the term refers to those Air Force aircraft whose primary mission is to transport the president; however, any U.S. Air Force aircraft...

     is the radio call sign of any Air Force
    United States Air Force
    The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

     plane the President of the United States
    President of the United States
    The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

     travels on. However, the term normally refers to a Boeing VC-25
    Boeing VC-25
    The Boeing VC-25 is the designation of a United States Air Force passenger transportation aircraft, a military version of the Boeing 747 airliner. The A-model is the only variant of the VC-25....

    A the President normally uses. While the VC-25A is equipped with numerous systems to ensure its survival, in an emergency it is recommended that he use the National Airborne Operations Center.

  • National Airborne Operations Center (codenamed Nightwatch) is a Boeing E-4
    Boeing E-4
    The Boeing E-4 Advanced Airborne Command Post, with a project name of "Nightwatch", is an aircraft operated by the United States Air Force...

     specially built to serve as a survivable mobile command post for the National Command Authority
    National Command Authority
    National Command Authority is a term used by the Department of Defense of the United States of America to refer to the ultimate lawful source of military orders. The NCA comprises the President of the United States and the Secretary of Defense jointly, or their duly deputized successors, i.e...

     (NCA). Either the President or the Secretary of Defense
    United States Secretary of Defense
    The Secretary of Defense is the head and chief executive officer of the Department of Defense of the United States of America. This position corresponds to what is generally known as a Defense Minister in other countries...

     may use it. It is also possible that the President would authorize the Vice President
    Vice President of the United States
    The Vice President of the United States is the holder of a public office created by the United States Constitution. The Vice President, together with the President of the United States, is indirectly elected by the people, through the Electoral College, to a four-year term...

     or others to use it, depending on the circumstances.
  • Looking Glass
    Looking Glass (airplane)
    Looking Glass is the code name for an airborne command center currently operated by the U.S. Navy. It provides command and control of U.S. nuclear forces in the event that ground-based command centers are destroyed or otherwise rendered inoperable.The Looking Glass was initiated by the U.S...

     is USSTRATCOM's Airborne Command Post, designed to take over in case NORAD's Cheyenne Mountain Directorate is destroyed or incapable of communicating with strategic forces. Beginning February 3, 1961, an Air Force Looking Glass aircraft was in the air at all times 24 hours a day, 365 days a year. On July 24, 1990, Looking Glass ceased continuous airborne alert but remained on ground or airborne alert 24 hours a day. On Oct. 1, 1998, the U.S. Navy replaced the U.S. Air Force. In addition, a battle staff now flies with the TACAMO
    TACAMO
    TACAMO is a U.S. military term meaning "Take Charge and Move Out". TACAMO refers to a system of survivable communications links designed to be used in nuclear war to maintain communications between the decision makers and the triad of strategic nuclear weapon delivery systems...

     crew.

Ships

Two National Emergency Command Post Afloat
National Emergency Command Post Afloat
The National Emergency Command Post Afloat was part of the United States government's continuity of government plans during the 1960s. It was one third of a triad composing of airborne, ground and sea-based assets.-History:...

.

The USS Northampton (CLC-1)
USS Northampton (CLC-1)
The third USS Northampton was a US Navy command light cruiser . She was laid down as an Oregon City class heavy cruiser , on 31 August 1944 by the Fore River Yard, Bethlehem Steel Corp., Quincy, Mass. Work suspended between 11 August 1945 and 1 July 1948; she was launched as CLC–1, on 27 January...

 was converted into Command ship
Command ship
Command ships serve as the flagships of the Commander of a fleet. They provide communications, office space, and accommodations for a fleet commander and his staff, and serve to coordinate fleet activities....

 CC-1 between 1961.

The USS Wright (CVL-49)
USS Wright (CVL-49)
The USS Wright was a Saipan-class light aircraft carrier of the United States Navy, later converted to the command ship CC-2. It is the second ship named "Wright"...

 was converted into Command ship (CC-2) between 1962 and 1963 and included the National Military Command System.

These vessels were decommissioned in 1970.

Communication

Communication is vital during a catastrophic event. Military communication links are designed for extreme situations such as nuclear war and thus considered more "survivable" than civilian networks. The Defense Information Systems Agency
Defense Information Systems Agency
The Defense Information Systems Agency is a United States Department of Defense agency that provides information technology and communications support to the President, Vice President, Secretary of Defense, the military Services, and the Combatant Commands.As part of the Base Realignment and...

 is in charge of supporting command, control, communications, and information systems for the military and would support the NCA. It is assumed that the various bunkers and airplanes have been equipped with special communication equipment to survive a catastrophe.

  • Internet
    Internet
    The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite to serve billions of users worldwide...

     - The Internet began as the ARPANET
    ARPANET
    The Advanced Research Projects Agency Network , was the world's first operational packet switching network and the core network of a set that came to compose the global Internet...

    , a program funded by the U.S. military. The Internet is designed with the capability to withstand losses of large portions of the underlying networks, but due to the huge numbers of people using it, it would likely be jammed and unable to handle communication if it suffered a large amount of damage. During a localized emergency, it is highly useful. However, the loss of electrical power to an area can make accessing the Internet difficult or impossible.

  • Communications satellite
    Communications satellite
    A communications satellite is an artificial satellite stationed in space for the purpose of telecommunications...

    s - Basically immune to any ground catastrophe, it is expected that military communication satellites would provide the government with the ability to communicate in any situation other than one that includes a direct attack upon the satellites.
  • Homeland security takes over communications May 9, 2007

(16) The Secretary of Homeland Security shall:
(h) As Executive Agent of the National Communications System, develop, implement, and maintain a comprehensive continuity communications architecture.

See also

  • Main Core
    Main Core
    Main Core is the code name of a database maintained since the 1980s by the federal government of the United States. Main Core contains personal and financial data of millions of U.S. citizens believed to be threats to national security. The data, which comes from the NSA, FBI, CIA, and other...

  • National Response Framework
    National Response Framework
    The United States National Response Framework is part of the National Strategy for Homeland Security that presents the guiding principles enabling all levels of domestic response partners to prepare for and provide a unified national response to disasters and emergencies...

  • National Security and Homeland Security Presidential Directive
    National Security and Homeland Security Presidential Directive
    The National Security and Homeland Security Presidential Directive , created and signed by United States President George W...

  • Presidential directive
    Presidential directive
    Presidential Directives, better known as Presidential Decision Directives or PDD are a form of an executive order issued by the President of the United States with the advice and consent of the National Security Council...

  • Rex 84
    Rex 84
    Rex 84, short for Readiness Exercise 1984, was a secretive "scenario and drill" developed by the United States federal government to suspend the United States Constitution, declare martial law, place military commanders in charge of state and local governments, and detain large numbers of American...



General:
  • Continuity of Government
    Continuity of government
    Continuity of government is the principle of establishing defined procedures that allow a government to continue its essential operations in case of nuclear war or other catastrophic event....

  • Critical Infrastructure Protection
    Critical Infrastructure Protection
    Critical infrastructure protection is a concept that relates to the preparedness and response to serious incidents that involve the critical infrastructure of a region or nation....

  • Disaster recovery
    Disaster recovery
    Disaster recovery is the process, policies and procedures related to preparing for recovery or continuation of technology infrastructure critical to an organization after a natural or human-induced disaster. Disaster recovery is a subset of business continuity...



Civilian:
  • Business continuity planning
    Business continuity planning
    Business continuity planning “identifies [an] organization's exposure to internal and external threats and synthesizes hard and soft assets to provide effective prevention and recovery for the organization, whilst maintaining competitive advantage and value system integrity”. It is also called...


External links

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