user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: who was the president of the us in 1971? 
Knowledge Triplets: Vice President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Jack Ryan
United States of America, people.person.nationality, Richard Nixon
US President, freebase.type_profile.strict_included_types, Topic
Theodore Roosevelt, government.us_vice_president.to_president, William McKinley
President of the United States, common.topic.webpage, m.05ckhcc
Andrew Jackson, government.us_president.vice_president, Martin Van Buren
President of the United States, government.government_office_or_title.office_holders, m.03fx88b
Richard Nixon, common.topic.notable_types, US President
m.0663zsk, common.webpage.topic, President of the United States
m.09xm31x, common.webpage.topic, President of the United States
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Abraham Lincoln
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Matt Santos
Harry S. Truman, people.person.nationality, United States of America
John F. Kennedy, common.topic.notable_types, US President
Rutherford B. Hayes, common.topic.notable_types, US President
William Howard Taft, people.person.nationality, United States of America
Lt. Cmdr. Robby Jackson, fictional_universe.fictional_character.occupation, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.02hz5r6
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Ulysses S. Grant
Jimmy Carter, common.topic.notable_types, US President
President of the United States, book.book_subject.works, Madam President
m.09xlnpm, common.webpage.topic, President of the United States
Jack Ryan, fictional_universe.fictional_character.occupation, President of the United States
Dwight D. Eisenhower, government.politician.government_positions_held, m.0446b8l
President of the United States, award.award_presenting_organization.awards_presented, National Medal of Technology and Innovation
m.09ynr7x, common.webpage.topic, President of the United States
Ronald Reagan, government.us_president.vice_president, George H. W. Bush
Dwight D. Eisenhower, people.person.profession, Politician
The Reader's Companion to the American Presidency, book.written_work.editor, Davis Dyer
President of the United States, government.government_office_or_title.office_holders, m.04469y8
US President, freebase.type_profile.published, Published
m.0b464_j, common.webpage.topic, President of the United States
Millard Fillmore, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.03fx8cf
President of the United States, book.book_subject.works, The Sound of Leadership: Presidential Communication in the Modern Age
US President, freebase.type_hints.included_types, Topic
President of the United States, government.government_office_or_title.office_holders, m.04s_2dh
President of the United States, government.government_office_or_title.office_holders, m.03fx8c3
Zachary Taylor, common.topic.notable_types, US President
John Quincy Adams, common.topic.notable_types, US President
m.02k6vpl, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.webpage, m.0hnjbwk
m.0446b9j, government.government_position_held.office_position_or_title, President of the United States
m.05ckhcc, common.webpage.topic, President of the United States
m.07nflbk, base.ontologies.ontology_instance_mapping.freebase_topic, President of the United States
John Adams, common.topic.notable_types, US President
President number, rdf-schema#domain, US President
m.09y9g34, common.webpage.topic, President of the United States
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, President Thomas Westwood
Franklin D. Roosevelt, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.04469xf
Vice President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Lt. Cmdr. Robby Jackson
President of the United States, book.book_subject.works, President Pennybaker
m.0446b70, government.government_position_held.office_position_or_title, President of the United States
Vice President of the United States, government.government_office_or_title.jurisdiction, United States of America
George Washington, government.us_president.vice_president, John Adams
m.04469xv, government.government_position_held.office_position_or_title, President of the United States
m.03fx899, government.government_position_held.office_holder, Theodore Roosevelt
President of the United States, government.government_office_or_title.office_holders, m.0446bcc
US President, type.type.expected_by, President
m.04466xb, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.webpage, m.04lsvx0
m.0c1svhh, people.appointment.appointed_role, President of the United States
Ronald Reagan, people.person.nationality, United States of America
Conrad Dalton, fictional_universe.fictional_character.occupation, President of the United States
President of the United States, base.firsts.achievement.firsts, m.04wrx4g
m.03fx88m, government.government_position_held.office_position_or_title, President of the United States
President of the United States, base.schemastaging.context_name.plural, m.0w0qt9b
James Buchanan, common.topic.notable_types, US President
m.09ysj6g, common.webpage.topic, President of the United States
m.03fx7zy, government.government_position_held.office_position_or_title, President of the United States
James A. Garfield, government.us_president.vice_president, Chester A. Arthur
US President, type.type.expected_by, Owner
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Town Destroyer
Harry S. Truman, people.person.quotations, Being a President is like riding a tiger. A man has to keep on riding or he is swallowed.
President of the United States, government.government_office_or_title.office_holders, m.03fx899
US President, freebase.type_hints.included_types, Person
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Josiah Bartlet
President of the United States, government.government_office_or_title.office_holders, m.04466tx
President of the United States, book.book_subject.works, The American Leadership Tradition: Moral Vision from Washington to Clinton
President of the United States, government.government_office_or_title.office_holders, m.02s9flj
Vice president, rdf-schema#domain, US President
First Off the Tee: Presidential Hackers, Duffers, and Cheaters From Taft to Bush, book.written_work.subjects, President of the United States
George Washington, first President of the United States, common.image.size, m.02f0j1t
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Cast of Dasavathaaram
President of the United States, common.topic.image, George Washington, first President of the United States
President Thomas Westwood, fictional_universe.fictional_character.occupation, President of the United States
Lt. Cmdr. Robby Jackson, fictional_universe.fictional_character.occupation, Vice President of the United States
James Monroe, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.03fx87q
President of the United States, government.government_position_held.office_position_or_title, m.03fx8cf
President of the United States, government.government_office_or_title.office_holders, m.0446bdb
President of the United States, government.government_office_or_title.office_holders, m.0446b9r
The Reader's Companion to the American Presidency, book.written_work.editor, Alan Brinkley
Warren G. Harding, government.us_president.vice_president, Calvin Coolidge
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, common.topic.article, m.063t8my
President of the United States, common.topic.webpage, m.0b464_j
George Washington, first President of the United States, common.image.appears_in_topic_gallery, The Imperial Presidency
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, common.topic.notable_types, Book
Chester A. Arthur, government.us_vice_president.to_president, James A. Garfield
President of the United States, government.government_office_or_title.office_holders, m.03fx838
President of the United States, government.government_office_or_title.office_holders, m.02k6vpl
Dwight D. Eisenhower, common.topic.notable_types, US President
m.03fx83v, government.government_position_held.office_position_or_title, President of the United States
William Henry Harrison, government.us_president.vice_president, John Tyler
'West Wing': The next Fake President of the United States is..., common.resource.annotations, m.09xlnjq
President of the United States, common.topic.webpage, m.09xgz2n
m.09ygxjq, common.webpage.topic, President of the United States
Andrew Johnson, common.topic.notable_types, US President
Abraham Lincoln, common.topic.notable_types, US President
President of the United States, common.topic.article, m.060dd
President of the United States, government.government_office_or_title.office_holders, m.04466xm
m.03fx817, government.government_position_held.office_position_or_title, President of the United States
Barack Obama, common.topic.notable_types, US President
President of the United States, base.schemastaging.context_name.pronunciation, g.125_lw0zw
Bill Clinton, common.topic.notable_types, US President
m.09w6h41, common.webpage.topic, President of the United States
Richard Nixon, people.person.nationality, United States of America
Zachary Taylor, government.us_president.vice_president, Millard Fillmore
m.04466tx, government.government_position_held.office_position_or_title, President of the United States
The Reader's Companion to the American Presidency, book.book.genre, Non-fiction
US President, freebase.type_profile.kind, Significant
m.03fx7hy, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.webpage, m.09xm31x
President of the United States, government.government_office_or_title.office_holders, m.04469xv
George Washington, first President of the United States, common.image.appears_in_topic_gallery, George Washington
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, book.written_work.author, Peter Rodman
m.03fx85y, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx8bt
President of the United States, business.employer.employees, m.0czp5hh
President of the United States, government.government_office_or_title.office_holders, m.02h6phn
m.09xlnpm, common.webpage.resource, 'West Wing': The next Fake President of the United States is...
George H. W. Bush, government.us_vice_president.to_president, Ronald Reagan
m.04469xf, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.webpage, m.0663zsk
President of the United States, common.topic.webpage, m.09ygxjq
m.03fx88b, government.government_position_held.office_position_or_title, President of the United States
President of the United States, book.book_subject.works, What Do We Do Now?: A Workbook for the President-elect
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Lt. Cmdr. Robby Jackson
Madam President, book.written_work.subjects, President of the United States
President of the United States, common.topic.webpage, m.09ynr7x
m.04466xz, government.government_position_held.office_position_or_title, President of the United States
m.03fx8bt, government.government_position_held.office_position_or_title, President of the United States
Ulysses S. Grant, common.topic.notable_types, US President
m.03q2h_9, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.image, Official portrait of Barack Obama
President of the United States, book.book_subject.works, Otto Runs for President
The Rhetorical Presidency, book.written_work.subjects, President of the United States
US President, freebase.type_profile.equivalent_topic, President of the United States
m.08ntjg4, base.firsts.first_achievement.achievement, President of the United States
Dwight D. Eisenhower, people.person.profession, Soldier
The Reader's Companion to the American Presidency, common.topic.notable_for, g.125bp0g1z
John Tyler, common.topic.notable_types, US President
Andrew Jackson, common.topic.notable_types, US President
Lyndon B. Johnson, government.us_vice_president.to_president, John F. Kennedy
m.03fx81_, government.government_position_held.office_position_or_title, President of the United States
William Henry Harrison, common.topic.notable_types, US President
Gerald Ford, government.us_vice_president.to_president, Richard Nixon
President of the United States, common.topic.webpage, m.0b46f7h
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Powers of the President of the United States
James A. Garfield, common.topic.notable_types, US President
m.09y93hy, common.webpage.topic, President of the United States
m.0446bdb, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.webpage, m.09xlnpm
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Presidency of George Washington
President of the United States, book.book_subject.works, The Moral Rhetoric of American Presidents
US President, type.type.domain, Government
Franklin Pierce, common.topic.notable_types, US President
President of the United States, award.award_presenting_organization.awards_presented, National Medal of Science
President of the United States, base.ontologies.ontology_class.equivalent_classes, m.0dj2gvv
President of the United States, government.government_office_or_title.office_holders, m.04466zr
President of the United States, book.book_subject.works, White House Ghosts: Presidents and Their Speechwriters
Thomas Jefferson, government.us_vice_president.to_president, John Adams
Max for President, book.written_work.subjects, President of the United States
Dwight D. Eisenhower, people.person.nationality, United States of America
m.0b46f7h, common.webpage.topic, President of the United States
Herbert Hoover, common.topic.notable_types, US President
Franklin D. Roosevelt, people.person.profession, Soldier
President of the United States, government.government_office_or_title.office_holders, m.03fx83k
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, book.written_work.subjects, Foreign policy
US President, common.topic.article, m.03yy9v6
'West Wing': The next Fake President of the United States is..., common.resource.annotations, m.09xlnpm
US President, type.type.properties, Vice president
President of the United States, common.topic.notable_for, g.125734vfj
President of the United States, common.topic.webpage, m.09ysj6g
What Do We Do Now?: A Workbook for the President-elect, book.written_work.subjects, President of the United States
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, book.book.genre, Non-fiction
m.0hnjbwk, common.webpage.topic, President of the United States
President of the United States, book.book_subject.works, Max for President
Franklin D. Roosevelt, people.person.nationality, United States of America
I'm the only president you've got., media_common.quotation.author, Lyndon B. Johnson
President of the United States, book.book_subject.works, Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush
President of the United States, government.government_office_or_title.office_holders, m.0446b8l
m.03fx87q, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.04469yh
m.03fx83k, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.04466xb
Woodrow Wilson, common.topic.notable_types, US President
Abraham Lincoln, government.us_president.vice_president, Andrew Johnson
m.04s_2dh, government.government_position_held.office_position_or_title, President of the United States
m.03fx8cf, government.government_position_held.office_position_or_title, President of the United States
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, book.written_work.subjects, President of the United States
Abraham Lincoln, fictional_universe.fictional_character.occupation, President of the United States
Calvin Coolidge, common.topic.notable_types, US President
President of the United States, common.topic.webpage, m.09y9g34
President of the United States, book.book_subject.works, Grace for President
m.03fx7j8, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.webpage, m.09y93hy
m.03fx838, government.government_position_held.office_position_or_title, President of the United States
Franklin D. Roosevelt, government.us_president.vice_president, Harry S. Truman
President of the United States, government.government_office_or_title.office_holders, m.03fx82m
President of the United States, government.government_office_or_title.jurisdiction, United States of America
President of the United States, base.firsts.achievement.firsts, m.04wrwjv
John Adams, government.us_president.vice_president, Thomas Jefferson
President of the United States, government.government_office_or_title.office_holders, m.04466xz
Lyndon B. Johnson, common.topic.notable_types, US President
President of the United States, book.book_subject.works, Presidential Leadership: Rating the Best and the Worst in the White House
President of the United States, people.appointed_role.appointment, m.0c1svhh
m.03fx8c3, government.government_position_held.office_position_or_title, President of the United States
Official portrait of Barack Obama, common.image.appears_in_topic_gallery, President of the United States
Lyndon B. Johnson, people.person.quotations, I'm the only president you've got.
James K. Polk, common.topic.notable_types, US President
Harry S. Truman, common.topic.notable_types, US President
m.04wrwjv, base.firsts.first_achievement.achievement, President of the United States
John Tyler, government.us_vice_president.to_president, William Henry Harrison
President of the United States, base.firsts.achievement.firsts, m.04xdfjz
Harry S. Truman, government.us_vice_president.to_president, Franklin D. Roosevelt
US President, freebase.type_profile.kind, Title
m.040b_7k, government.government_position_held.office_position_or_title, President of the United States
President of the United States, book.book_subject.works, Poem for a President: Midnight Flight of the Poetry Angels
Martin Van Buren, common.topic.notable_types, US President
President of the United States, book.book_subject.works, The Rhetorical Presidency
President of the United States, award.award_presenting_organization.award_categories_presented, National Medal of Technology and Innovation
The Reader's Companion to the American Presidency, common.topic.notable_types, Book
Thomas Jefferson, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.01xrx8q
John F. Kennedy, government.us_president.vice_president, Lyndon B. Johnson
Jack Ryan, fictional_universe.fictional_character.occupation, Vice President of the United States
Benjamin Harrison, common.topic.notable_types, US President
Chester A. Arthur, common.topic.notable_types, US President
m.01xrx8q, government.government_position_held.office_position_or_title, President of the United States
m.04469y8, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx7hy
President of the United States, government.government_office_or_title.office_holders, m.0446b70
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, common.topic.notable_for, g.125f9cm5z
President Thomas Westwood, common.topic.notable_for, g.1q5jd3v2c
Alan Brinkley, book.author.works_edited, The Reader's Companion to the American Presidency
George H. W. Bush, common.topic.notable_types, US President
President of the United States, book.book_subject.works, First Off the Tee: Presidential Hackers, Duffers, and Cheaters From Taft to Bush
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Mackenzie Allen
Matt Santos, fictional_universe.fictional_character.occupation, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.0446bdk
Warren G. Harding, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.03fx85y
Theodore Roosevelt, government.politician.government_positions_held, m.03fx899
President of the United States, common.topic.webpage, m.09w6pyk
m.04466xm, government.government_position_held.office_position_or_title, President of the United States
m.02hz5r6, government.government_position_held.office_position_or_title, President of the United States
Millard Fillmore, government.us_vice_president.to_president, Zachary Taylor
m.09xlnjq, common.webpage.resource, 'West Wing': The next Fake President of the United States is...
m.04469y1, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.0446b9j
m.03fx899, government.government_position_held.office_position_or_title, President of the United States
John F. Kennedy, freebase.valuenotation.is_reviewed, President number
President of the United States, government.government_office_or_title.office_holders, m.03fx83v
Herbert Hoover, people.person.nationality, United States of America
Theodore Roosevelt, people.person.profession, Historian
m.03fx8cf, government.politician.government_positions_held, Richard Nixon
Calvin Coolidge, government.us_vice_president.to_president, Warren G. Harding
President of the United States, government.government_office_or_title.office_holders, m.03fx88m
Dwight D. Eisenhower, government.us_president.vice_president, Richard Nixon
Franklin D. Roosevelt, people.person.profession, Politician
Lyndon B. Johnson, people.person.nationality, United States of America
President of the United States, government.government_office_or_title.office_holders, m.03fx817
President of the United States, business.employer.employees, m.0whvvj4
US President, common.topic.notable_types, Richard Nixon
Theodore Roosevelt, common.topic.notable_types, US President
m.09xgz2n, common.webpage.topic, President of the United States
m.02h6phn, government.government_position_held.office_position_or_title, President of the United States
United States of America, government.governmental_jurisdiction.government_positions, President of the United States
Richard Nixon, government.us_president.vice_president, Gerald Ford
Richard Nixon, government.us_vice_president.to_president, Dwight D. Eisenhower
Woodrow Wilson, people.person.nationality, United States of America
m.03fx7_v, government.government_position_held.office_position_or_title, President of the United States
m.0446b9r, government.government_position_held.office_position_or_title, President of the United States
m.09w6pyk, common.webpage.topic, President of the United States
James Madison, common.topic.notable_types, US President
m.02s9flj, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx81_
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, common.topic.image, command.jpg
George Washington, common.topic.image, George Washington, first President of the United States
Josiah Bartlet, fictional_universe.fictional_character.occupation, President of the United States
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, book.written_work.subjects, Politics of the United States
m.09wvy_x, common.webpage.topic, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.02kzpyv
President of the United States, common.topic.notable_types, Government Office or Title
President of the United States, award.award_presenting_organization.awards_presented, Presidential Medal of Freedom
m.0446bdk, government.government_position_held.office_position_or_title, President of the United States
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Conrad Dalton
President of the United States, government.government_office_or_title.office_holders, m.04469y1
President of the United States, common.topic.webpage, m.09wvy_x
Gerald Ford, common.topic.notable_types, US President
William McKinley, government.us_president.vice_president, Theodore Roosevelt
The Reader's Companion to the American Presidency, common.topic.article, m.0770wzg
President of the United States, common.topic.webpage, m.09w6h41
Ronald Reagan, common.topic.notable_types, US President
George W. Bush, common.topic.notable_types, US President
Martin Van Buren, government.us_vice_president.to_president, Andrew Jackson
Ulysses S. Grant, fictional_universe.fictional_character.occupation, President of the United States
m.04466zr, government.government_position_held.office_position_or_title, President of the United States
William Howard Taft, common.topic.notable_types, US President
m.0dj2gvv, base.ontologies.ontology_class_mapping.freebase_topic, President of the United States
George Washington, first President of the United States, common.image.appears_in_topic_gallery, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx7_v
President of the United States, government.government_office_or_title.jurisdiction, United States of America
m.04wrx4g, base.firsts.first_achievement.achievement, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx7zy
m.0446b8l, government.government_position_held.office_position_or_title, President of the United States
US President, freebase.type_hints.included_types, Politician
President of the United States, book.book_subject.works, The Reader's Companion to the American Presidency
President of the United States, book.book_subject.works, Burn Before Reading: Presidents, CIA Directors, and Secret Intelligence
The Reader's Companion to the American Presidency, book.written_work.subjects, President of the United States
The Reader's Companion to the American Presidency, book.book.editions, The Reader's Companion to the American Presidency
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President of the United States, government.government_office_or_title.office_holders, m.040b_7k
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President of the United States, government.government_office_or_title.category, President
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Otto Runs for President, book.written_work.subjects, President of the United States
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m.02kzpyv, government.government_position_held.office_position_or_title, President of the United States
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President of the United States, freebase.equivalent_topic.equivalent_type, US President
m.04xdfjz, base.firsts.first_achievement.achievement, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03q2h_9

Answer: Richard Nixon