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: Which Judges on the supreme court were appointed by Barack Obama? 
Knowledge Triplets: Barack Obama, government.political_appointer.appointees, m.0k9_4xg
Barack Obama, Sr., people.person.children, Auma Obama
m.04_2vlm, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, common.topic.webpage, m.0bhg2cz
Barack Obama, people.person.sibling_s, m.0kv53ff
Barack Obama, Sr., people.person.children, Abo Obama
m.0r60ybv, government.government_position_held.appointed_by, Barack Obama
m.0bvbn3r, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05bh_5w
Constitutional law, base.crime.lawyer_type.lawyers_of_this_type, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05bj120
Supreme Court of the United States, business.employer.employees, m.0g7nhqb
Barack Obama, people.person.employment_history, m.02nqgsc
m.05bp2yr, government.government_position_held.appointed_by, Barack Obama
m.0jtmkth, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.052mbx6
m.09qggj9, award.ranking.item, Barack Obama
Barack Obama, people.person.employment_history, m.02nqgqh
Supreme Court of the United States, business.employer.employees, m.0g8l05m
Barack Obama, government.political_appointer.appointees, m.05v3kv0
Barack Obama, government.political_appointer.appointees, m.0jtmkth
m.0jtl_wm, government.government_position_held.appointed_by, Barack Obama
Supreme Court of California, law.court.judges, m.0n1_p4l
Barack Obama, government.political_appointer.appointees, m.04_5lb8
Supreme Court of California, law.court.judges, m.05kdtn3
Chief Justice of the United States, book.book_subject.works, Leaving the Bench: Supreme Court Justices at the End
Barack Obama, government.political_appointer.appointees, m.0q4mpmt
Barack Obama, government.politician.legislative_committees_served_on, m.03h9hnh
Supreme Court of Alabama, law.court.judges, m.0wzgvh0
Supreme Court of the United States, business.employer.employees, m.050yyrp
Barack Obama, freebase.valuenotation.is_reviewed, Spouse (or domestic partner)
m.0k9_61x, government.government_position_held.appointed_by, Barack Obama
Supreme Court of California, law.court.judges, m.0n1_nxd
m.0k9_4xg, government.government_position_held.appointed_by, Barack Obama
Leaving the Bench: Supreme Court Justices at the End, book.written_work.subjects, Chief Justice of the United States
Barack Obama, people.person.nationality, United States of America
Barack Obama, government.political_appointer.appointees, m.0wkxqyy
Barack Obama, government.political_appointer.appointees, m.05bht4v
Barack Obama, government.political_appointer.appointees, m.0j35vth
Children, freebase.valuenotation.has_no_value, Elena Kagan
Law professor, people.person.profession, Elena Kagan
Barack Obama, freebase.valuenotation.is_reviewed, Gender
Barack Obama, government.political_appointer.appointees, m.052lwd3
Barack Obama, base.firsts.first.achievements, m.05gmrc3
m.03h96h6, government.government_position_held.office_holder, Barack Obama
Supreme Court of the United States, business.employer.employees, m.0g8kz8n
Barack Obama, government.political_appointer.appointees, m.05bhs1w
Barack Obama, people.person.quotations, Yes we can!
m.0w8v5d0, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05lmlyn
Barack Obama in His Own Words, book.book_edition.binding, Paperback
Barack Obama, Sr., people.person.profession, Politician
Supreme Court of the United States, common.topic.webpage, m.0b6rm1f
Barack Obama, common.topic.notable_types, US President
m.09w3qtm, government.government_position_held.appointed_by, Barack Obama
m.0r5y214, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.places_lived, m.03xdty5
Barack Obama, government.political_appointer.appointees, m.05bh_20
Barack Obama, government.politician.government_positions_held, m.03h9hn4
Supreme Court of Florida, law.court.judges, m.0kn445k
m.0wkxqyy, government.government_position_held.appointed_by, Barack Obama
Date of birth, freebase.valuenotation.is_reviewed, Elena Kagan
m.05g2cp1, government.government_position_held.appointed_by, Barack Obama
Barack Obama, Sr., people.person.children, Barack Obama
Supreme Court of the United States, business.employer.employees, m.0g7mqhp
Supreme Court of the United States, book.book_subject.works, Making Constitutional Law: Thurgood Marshall and the Supreme Court, 1961-1991
Barack Obama, government.political_appointer.appointees, m.0jb8k42
The Supreme Court, book.book.genre, Biography
Barack Obama, government.political_appointer.appointees, m.04_5kfv
Barack Obama, government.political_appointer.appointees, m.0k9_6d4
m.0jb8k42, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05gwyg2
Supreme Court of Florida, law.court.judges, m.05cb5j2
Barack Obama, people.person.profession, Writer
Barack Obama, people.person.employment_history, m.02nqgy7
Supreme Court of the United States, book.book_subject.works, Making Our Democracy Work
Barack Obama, government.political_appointer.appointees, m.0j34rt6
Supreme Court of the United States, business.employer.employees, m.0g9bfy3
Supreme Court of the United States, business.employer.employees, m.04flfdj
Supreme Court of the United States, common.topic.article, m.07szc
m.05bh_kg, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.sibling_s, m.0kv53fr
Barack Obama, freebase.valuenotation.is_reviewed, Children
Barack Obama, government.political_appointer.appointees, m.0znj0g4
Barack Obama, government.political_appointer.appointees, m.05bh_kg
m.05bh__x, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.places_lived, m.03xdtyk
m.010hc1p6, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, common.resource.annotations, m.02h6wqn
Barack Obama, people.person.education, m.02nqgp6
m.09knk78, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, business.employer.employees, m.0g8k_44
Barack Obama, government.political_appointer.appointees, m.09rg1bz
m.063wq62, base.popstra.legal_dispute.plaintiff, Barack Obama
Barack Obama, common.topic.image, Barack Obama Senate Portrait
Barack Obama, people.person.profession, Law professor
Barack Obama, people.person.sibling_s, m.0n4sqh8
m.05lmlyn, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.education, m.012m6w18
Barack Obama, people.person.education, m.012l94sv
m.05ctx2h, government.government_position_held.appointed_by, Barack Obama
m.05bj120, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.sibling_s, m.0n4sqkd
m.05bj04r, government.government_position_held.appointed_by, Barack Obama
m.05bhv8k, government.government_position_held.appointed_by, Barack Obama
m.05g438r, government.government_position_held.appointed_by, Barack Obama
m.04_5kfv, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.010qyt8y
Barack Obama Senate Portrait, common.image.appears_in_topic_gallery, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05g2cp1
Barack Obama, people.person.places_lived, m.04s_x47
Barack Obama, people.person.religion, Christianity
Supreme Court of the United States, business.employer.employees, m.04d24ly
Barack Obama, government.political_appointer.appointees, m.05ftbw9
Chief Justice of the United States, common.topic.image, Seal of the Supreme Court
m.05gwyg2, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.politician.government_positions_held, m.04s_2dh
Supreme Court of California, law.court.judges, m.05kdtmy
Barack Obama, people.person.ethnicity, English American
Supreme Court of the United States, common.topic.webpage, m.02h6wqn
m.010g2x8g, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, common.topic.image, Picture 112a
m.010g2xdb, government.government_position_held.appointed_by, Barack Obama
m.010qyt8y, government.government_position_held.appointed_by, Barack Obama
Barack Obama, common.topic.notable_for, g.1258j10lr
Supreme Court of the United States, business.employer.employees, m.04fzfd3
Barack Obama, government.political_appointer.appointees, m.09vkg_2
Barack Obama, government.political_appointer.appointees, m.05bh_yd
The Supreme Court, book.book.editions, The Supreme Court
Barack Obama, government.political_appointer.appointees, m.0jtl_wm
m.0w25ghz, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.0wzl8h_
Barack Obama, royalty.chivalric_order_officer.memberships_presented, m.0w17p88
Barack Obama, government.political_appointer.appointees, m.010g2c43
Barack Obama, government.political_appointer.appointees, m.010hc1p6
m.0j35vth, government.government_position_held.appointed_by, Barack Obama
m.05g5040, government.government_position_held.appointed_by, Barack Obama
m.052lwd3, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, law.court.jurisdiction, United States of America
Supreme Court of California, law.court.judges, m.05kdtmq
Barack Obama, government.political_appointer.appointees, m.010p3jbd
Supreme Court of the United States, book.book_subject.works, The Supreme Court
m.05bj0_8, government.government_position_held.appointed_by, Barack Obama
United States of America, people.person.nationality, Elena Kagan
Barack Obama, government.us_president.vice_president, Joe Biden
m.05nd5t7, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.010g2x8g
Supreme Court of the United States, business.employer.employees, m.04q4v60
Supreme Court of the United States, government.governmental_body.body_this_is_a_component_of, Federal judiciary of the United States
Barack Obama, government.political_appointer.appointees, m.064d51m
Barack Obama, common.topic.article, m.02wh0cm
Supreme Court of the United States, law.court.courthouse, m.064gmmw
m.0q4ng3y, government.government_position_held.appointed_by, Barack Obama
Oregon Supreme Court, law.court.judges, m.0k3g47r
m.05bh_20, government.government_position_held.appointed_by, Barack Obama
Massachusetts Supreme Judicial Court, law.court.judges, m.0hn35yg
BarackObama, internet.blog.blogger, Barack Obama
Supreme Court of Alabama, law.court.judges, m.0wzgx4m
Barack Obama in His Own Words, book.book_edition.isbn, 9780786720576
Barack Obama, government.political_appointer.appointees, m.0v4q6n5
Barack Obama, government.political_appointer.appointees, m.0tlzpxk
Supreme Court of the United States, government.governmental_body.offices_positions, Chief Justice of the United States
Barack Obama, government.politician.legislative_committees_served_on, m.03h9hp_
m.0nd7wz9, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, business.employer.employees, m.0g8mqm2
Barack Obama, common.topic.image, Official portrait of Barack Obama
Barack Obama, people.person.education, m.0nbyhy_
The Case Against Barack Obama: The Unlikely Rise and Unexamined Agenda of the Media's Favorite Candidate, book.written_work.original_language, English Language
Supreme Court of the United States, book.book_subject.works, The Warren Court and American Politics
Barack Obama, people.person.profession, Politician
Barack Obama, government.political_appointer.appointees, m.07nt04k
Supreme Court of California, law.court.judges, m.05kdtlz
m.0q4lvc7, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.nationality, United States of America
Barack Obama, government.political_appointer.appointees, m.05pv1bq
Barack Obama, government.political_appointer.appointees, m.05ctx2h
Barack Obama, government.political_appointer.appointees, m.052m8b1
Barack Obama, government.political_appointer.appointees, m.05nd5t7
Barack Obama, government.political_appointer.appointees, m.0nd7wz9
m.0wzl8x_, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.profession, Lawyer
m.05bh_5w, government.government_position_held.appointed_by, Barack Obama
m.064d51m, government.government_position_held.appointed_by, Barack Obama
m.05v3kv0, government.government_position_held.appointed_by, Barack Obama
m.0115sj6s, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.0k06hnf
Barack Obama, people.person.sibling_s, m.0n4sqk2
m.04s_2dh, government.government_position_held.office_holder, Barack Obama
Barack Obama, Sr., people.person.children, David Ndesandjo
Federal judiciary of the United States, government.governmental_body.component_bodies, Supreme Court of the United States
Supreme Court of Alabama, law.court.judges, m.0wzgvp5
Barack Obama in His Own Words, common.topic.notable_for, g.1258yx_5g
m.0527js1, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, common.topic.image, US Supreme Court Building
m.05bh_yd, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05bhv8k
m.0w2cph_, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, book.book_subject.works, Courtiers of the Marble Palace: The Rise and Influence of the Supreme Court Law Clerk
Barack Obama, government.political_appointer.appointees, m.05bh_ms
Barack Obama, government.political_appointer.appointees, m.010g2w70
m.05pv1bq, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05bj130
Barack Obama, common.topic.notable_for, g.125920_xt
m.0jtlxf_, government.government_position_held.appointed_by, Barack Obama
m.052mbx6, government.government_position_held.appointed_by, Barack Obama
Barack Obama, freebase.valuenotation.is_reviewed, Date of birth
Barack Obama, government.political_appointer.appointees, m.09w3qtm
Supreme Court of the United States, base.schemastaging.context_name.pronunciation, m.01314qnc
m.04_5lb8, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05bp1tv
The Case Against Barack Obama: The Unlikely Rise and Unexamined Agenda of the Media's Favorite Candidate, book.written_work.subjects, Barack Obama
Supreme Court of the United States, book.book_subject.works, Savannah Talks Troy Anthony Davis Series
m.010p3jbd, government.government_position_held.appointed_by, Barack Obama
Supreme Court of California, law.court.judges, m.05kdtm4
Barack Obama, people.person.spouse_s, m.02nqglv
m.05bht4v, government.government_position_held.appointed_by, Barack Obama
m.05kcjbj, government.government_position_held.appointed_by, Barack Obama
m.0k9_6d4, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.politician.government_positions_held, m.03h96h6
Barack Obama Senate Portrait, common.image.size, m.02b54jd
Barack Obama, government.political_appointer.appointees, m.0wzl8x_
m.05f_33k, government.government_position_held.appointed_by, Barack Obama
m.05bhs1w, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, business.employer.employees, m.0g6992z
Barack Obama Senate Portrait, common.image.appears_in_topic_gallery, Current heads of state
Barack Obama, government.political_appointer.appointees, m.0w2cph_
Barack Obama, Sr., people.person.gender, Male
m.052m8b1, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, business.employer.employees, m.0g8kwyx
m.0znj0g4, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.parents, Barack Obama, Sr.
Law clerk, Justice William O. Douglas, United States Supreme Court, business.job_title.people_with_this_title, m.0g7mqhp
m.05bp1tv, government.government_position_held.appointed_by, Barack Obama
Barack Obama, base.crime.lawyer.lawyer_type, Constitutional law
Barack Obama, people.person.sibling_s, m.0n4sql0
m.05gmrc3, base.firsts.first_achievement.first, Barack Obama
Barack Obama, people.person.parents, Ann Dunham
Barack Obama, government.politician.party, m.03gjhww
m.0k06hnf, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.places_lived, m.03xdtyc
Barack Obama, government.political_appointer.appointees, m.05bp2yr
Barack Obama, government.political_appointer.appointees, m.010qp4_t
Barack Obama, government.political_appointer.appointees, m.05bj04r
Supreme Court of the United States, business.employer.employees, m.04kccmd
Place of birth, freebase.valuenotation.is_reviewed, Elena Kagan
Chief Justice of the United States, people.appointed_role.appointment, m.0hn34dz
Supreme Court of the United States, book.book_subject.works, The Least Dangerous Branch: The Supreme Court at the Bar of Politics
Barack Obama, government.political_appointer.appointees, m.010g2xdb
m.042249_, common.webpage.topic, Supreme Court of the United States
Barack Obama, government.political_appointer.appointees, m.0w8v5d0
m.0118nrhq, government.government_position_held.appointed_by, Barack Obama
m.09rg1bz, government.government_position_held.appointed_by, Barack Obama
Supreme Court of the United States, business.employer.employees, m.04fl5w8
m.0j34rt6, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.education, m.02nqgmw
Barack Obama, common.topic.article, m.02mjn1
Barack Obama, freebase.valuenotation.is_reviewed, Place of birth
Barack Obama, people.person.education, m.02nqgpk
Supreme Court of the United States, business.employer.employees, m.0g8kwgf
m.0jb89c0, government.government_position_held.appointed_by, Barack Obama
Barack Obama, people.person.profession, Author
Supreme Court of the United States, business.employer.employees, m.0g6cfd0
Barack Obama, internet.blogger.blog, BarackObama
Barack Obama, government.political_appointer.appointees, m.0q4ng3y
The Case Against Barack Obama: The Unlikely Rise and Unexamined Agenda of the Media's Favorite Candidate, common.topic.notable_types, Book
m.010g2c43, government.government_position_held.appointed_by, Barack Obama
m.0zrhnnr, government.government_position_held.appointed_by, Barack Obama
Vermont Supreme Court, law.court.judges, m.0x0svsz
m.05bh_ms, government.government_position_held.appointed_by, Barack Obama
m.0bvbn3r, government.politician.government_positions_held, Elena Kagan
Supreme Court of Texas, law.court.judges, m.0y7lmm1
Barack H. Obama: The Unauthorized Biography, common.topic.notable_for, g.125f8s1ny
Supreme Court of the United States, common.topic.image, Seal of the Supreme Court
Barack Obama in His Own Words, common.topic.notable_for, g.125d3_x15
Barack Obama, government.political_appointer.appointees, m.0bvbn3r
Barack Obama, people.person.education, m.012m4x3m
Barack Obama, Sr., people.person.children, George Obama
m.063wq6k, base.popstra.legal_dispute.defendant, Barack Obama
Supreme Court of California, law.court.judges, m.05kdtmj
m.010qp4_t, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.0118nrhq
m.0v4q6n5, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05g5040
Barack Obama, people.person.education, m.0nbyj44
The Case Against Barack Obama: The Unlikely Rise and Unexamined Agenda of the Media's Favorite Candidate, common.topic.notable_for, g.1257p9v69
Barack Obama, government.political_appointer.appointees, m.0k9_61x
Barack Obama, government.political_appointer.appointees, m.05bh__x
Barack Obama, government.political_appointer.appointees, m.0bvbn3r
Barack Obama, government.political_appointer.appointees, m.0r5y214
Barack Obama, people.person.education, m.0nbyhqc
Barack Obama, people.person.places_lived, m.05gmrjl
Barack Obama, government.political_appointer.appointees, m.0jtlxf_
Barack Obama, people.person.education, m.02nqgn2
Supreme Court of the United States, common.topic.webpage, m.042249_
Barack Obama, Sr., people.person.children, Mark Okoth Obama Ndesandjo
Leaving the Bench: Supreme Court Justices at the End, common.topic.notable_types, Book
Barack Obama, government.political_appointer.appointees, m.0115sj6s
Barack Obama, Sr., people.person.religion, Islam
m.03h9hn4, government.government_position_held.office_holder, Barack Obama
Barack Obama, people.person.sibling_s, m.0n4sqkk
m.0glx1wx, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.0glx1wx
Barack Obama, base.crime.lawyer.law_firm, Davis, Miner, Barnhill & Galland
Barack Obama, people.person.education, m.012m11bj
m.0wzl8h_, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05bj0_8
Barack Obama, government.political_appointer.appointees, m.0w25ghz
Leaving the Bench: Supreme Court Justices at the End, book.book.genre, Non-fiction
Gender, freebase.valuenotation.is_reviewed, Elena Kagan
Barack Obama, government.political_appointer.appointees, m.0jb89c0
Barack Obama, government.political_appointer.appointees, m.0r60ybv
Barack Obama, people.person.profession, Law professor
Barack Obama, government.political_appointer.appointees, m.05gh7qx
Lawyer, people.person.profession, Elena Kagan
Barack Obama, people.person.quotations, Just give it a try
Supreme Court of the United States, government.governmental_body.jurisdiction, United States of America
m.05ftbw9, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.04_2vlm
Barack Obama, government.political_appointer.appointees, m.05f_33k
Barack Obama, common.topic.image, Barack Obama
Supreme Court of the United States, business.employer.employees, m.0g69znr
m.0tlzpxk, government.government_position_held.appointed_by, Barack Obama
Spouse (or domestic partner), freebase.valuenotation.has_no_value, Elena Kagan
m.09vkg_2, government.government_position_held.appointed_by, Barack Obama
Barack Obama, base.firsts.first.achievements, m.04wrwjv
Barack Obama, common.image.appears_in_topic_gallery, bobbi4freedom
Barack Obama, government.political_appointer.appointees, m.09knk78
Barack Obama, government.political_appointer.appointees, m.05g438r
Supreme Court of California, law.court.judges, m.0n1_p4w
Supreme Court of California, law.court.judges, m.05kdtmb
The Case Against Barack Obama: The Unlikely Rise and Unexamined Agenda of the Media's Favorite Candidate, common.topic.article, m.04jch1s
Barack Obama, Sr., people.person.children, Bernard Obama
Barack Obama, people.person.education, m.012m9zwm
m.0q4mpmt, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.0q4lvc7
Barack Obama, government.political_appointer.appointees, m.0527js1
m.05gh7qx, government.government_position_held.appointed_by, Barack Obama
Barack Obama, government.political_appointer.appointees, m.05kcjbj
Supreme Court of the United States, common.topic.notable_for, g.125dtprfx
m.05bj130, government.government_position_held.appointed_by, Barack Obama
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Answer: Elena Kagan