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: What university did the public speaker, who spoke about education reform, attend? 
Knowledge Triplets: m.0svz5_5, education.education.institution, Columbia University
m.010f1r_g, education.education.institution, Columbia University
m.0667y_9, education.education.institution, Columbia University
m.04ysv28, education.education.institution, Columbia University
m.0h9bb14, education.education.institution, Columbia University
m.02wn8w_, education.education.institution, Columbia University
m.02wp911, education.education.institution, Columbia University
m.05yzb46, education.education.institution, Columbia University
m.04hsmw7, education.education.institution, Columbia University
m.02wncd9, education.education.institution, Columbia University
m.062yxn1, education.education.institution, Columbia University
m.0wltrl_, education.education.institution, Columbia University
m.02wmz41, education.education.institution, Columbia University
m.04q17l8, education.education.institution, Columbia University
m.02wpt87, education.education.institution, Columbia University
m.02wpny6, education.education.institution, Columbia University
m.04hry17, education.education.institution, Columbia University
m.0dwcny4, education.education.institution, Columbia University
m.06wjf21, education.education.institution, Columbia University
m.04hqch7, education.education.institution, Columbia University
m.05yyzp8, education.education.institution, Columbia University
m.02wptf9, education.education.institution, Columbia University
m.02wn_lq, education.education.institution, Columbia University
m.04mdln4, education.education.institution, Columbia University
m.0w59m_f, education.education.institution, Columbia University
m.02wnhk8, education.education.institution, Columbia University
m.02wpn18, education.education.institution, Columbia University
m.062yny1, education.education.institution, Columbia University
m.0bmyn08, education.education.institution, Columbia University
Education reform, event.speech_topic.speeches_or_presentations_on_this_topic, m.0j31vdq
m.0n1fy14, education.education.institution, Columbia University
m.02wnr77, education.education.institution, Columbia University
m.0zbfx16, education.education.institution, Columbia University
m.09vjlxt, education.education.institution, Columbia University
m.05y_tbs, education.education.institution, Columbia University
m.04hxfc7, education.education.institution, Columbia University
m.02_2l47, education.education.institution, Columbia University
m.02wnw10, education.education.institution, Columbia University
m.02wndz3, education.education.institution, Columbia University
m.02wnc11, education.education.institution, Columbia University
m.0667h_v, education.education.institution, Columbia University
m.02wnjc7, education.education.institution, Columbia University
m.05y_jx8, education.education.institution, Columbia University
m.02wmz66, education.education.institution, Columbia University
m.04hkqt8, education.education.institution, Columbia University
m.02wnwx0, education.education.institution, Columbia University
m.04lnjt8, education.education.institution, Columbia University
m.04lt3y7, education.education.institution, Columbia University
m.02wn_83, education.education.institution, Columbia University
m.02wn7z6, education.education.institution, Columbia University
m.02wnn68, education.education.institution, Columbia University
m.0n1kb_7, education.education.institution, Columbia University
m.02wn7y8, education.education.institution, Columbia University
m.03p721_, education.education.institution, Columbia University
m.05y_7d3, education.education.institution, Columbia University
m.09vjkw2, education.education.institution, Columbia University
m.02wmry3, education.education.institution, Columbia University
m.0svzw_w, education.education.institution, Columbia University
m.02wn_t2, education.education.institution, Columbia University
m.04q12_3, education.education.institution, Columbia University
m.07zqq_8, education.education.institution, Columbia University
m.0gv1mw_, education.education.institution, Columbia University
m.02wnm63, education.education.institution, Columbia University
m.02wns_l, education.education.institution, Columbia University
m.02wnbj8, education.education.institution, Columbia University
m.02wpq_6, education.education.institution, Columbia University
m.02wn857, education.education.institution, Columbia University
m.05y_4m2, education.education.institution, Columbia University
m.02wpmbw, education.education.institution, Columbia University
m.02wnm_1, education.education.institution, Columbia University
m.02wnm7b, education.education.institution, Columbia University
m.04hfl91, education.education.institution, Columbia University
Diane Ravitch, people.person.education, m.02wng19
m.02wpy56, education.education.institution, Columbia University
m.02wnwm9, education.education.institution, Columbia University
m.04htlv2, education.education.institution, Columbia University
m.02wpr3_, education.education.institution, Columbia University
m.02wmv31, education.education.institution, Columbia University
m.02wn1y1, education.education.institution, Columbia University
m.02wmyg6, education.education.institution, Columbia University
m.02wnw84, education.education.institution, Columbia University
m.02wn_56, education.education.institution, Columbia University
m.02wng19, education.education.institution, Columbia University
m.02wpmly, education.education.institution, Columbia University
m.02kq208, education.education.institution, Columbia University
m.07lt4h7, education.education.institution, Columbia University
m.0_l8y_1, education.education.institution, Columbia University
m.02wnfd2, education.education.institution, Columbia University
m.02wnjy2, education.education.institution, Columbia University
m.02wns49, education.education.institution, Columbia University
m.02wpft3, education.education.institution, Columbia University
m.04fmll_, education.education.institution, Columbia University
m.0667t16, education.education.institution, Columbia University
m.02nstx5, education.education.institution, Columbia University
m.02wpfq0, education.education.institution, Columbia University
m.04hnj_g, education.education.institution, Columbia University
m.0wlnxd7, education.education.institution, Columbia University
m.02wm_r1, education.education.institution, Columbia University
m.0h88z_9, education.education.institution, Columbia University
m.02wpt73, education.education.institution, Columbia University
m.02wnv96, education.education.institution, Columbia University
m.02wpbs8, education.education.institution, Columbia University
m.02kyf03, education.education.institution, Columbia University
m.02wnqy9, education.education.institution, Columbia University
m.03p7208, education.education.institution, Columbia University
m.05y_b35, education.education.institution, Columbia University
m.0b6wm_v, education.education.institution, Columbia University
m.07sstbw, education.education.institution, Columbia University
m.0n9_2y4, education.education.institution, Columbia University
m.0n0jy_w, education.education.institution, Columbia University
m.02wnb6_, education.education.institution, Columbia University
m.02wmsk8, education.education.institution, Columbia University
m.02wn7z9, education.education.institution, Columbia University
m.02wn6b3, education.education.institution, Columbia University
m.09scc20, education.education.institution, Columbia University
m.0zrqxw7, education.education.institution, Columbia University
m.09sd24y, education.education.institution, Columbia University
m.0hzv6y_, education.education.institution, Columbia University
m.02wpm54, education.education.institution, Columbia University
m.0mzvq_j, education.education.institution, Columbia University
m.04hxbw8, education.education.institution, Columbia University
m.02wn_d4, education.education.institution, Columbia University
m.07lgd23, education.education.institution, Columbia University
m.04hrr8_, education.education.institution, Columbia University
m.07sk4y9, education.education.institution, Columbia University
Education reform, book.book_subject.works, Left Back: A Century of Failed School Reforms
m.02wptx9, education.education.institution, Columbia University
m.02wplw9, education.education.institution, Columbia University
m.07ls_j2, education.education.institution, Columbia University
m.02wpbn4, education.education.institution, Columbia University
m.02wng19, education.educational_institution.students_graduates, Columbia University
m.0dff_17, education.education.institution, Columbia University
m.02sjh53, education.education.institution, Columbia University
m.0w5k5_2, education.education.institution, Columbia University
m.02wnx07, education.education.institution, Columbia University
m.04fmlm6, education.education.institution, Columbia University
m.02wnw73, education.education.institution, Columbia University
m.05y_p_1, education.education.institution, Columbia University
m.04kfrc4, education.education.institution, Columbia University
m.02wnxh1, education.education.institution, Columbia University
m.02wnf98, education.education.institution, Columbia University
m.02nqgn2, education.education.institution, Harvard Law School
m.02wn673, education.education.institution, Columbia University
m.05yy_ll, education.education.institution, Columbia University
m.02wpfc_, education.education.institution, Columbia University
m.09vjg16, education.education.institution, Columbia University
m.02wmt49, education.education.institution, Columbia University
m.09vjb42, education.education.institution, Columbia University
m.0648b_f, education.education.institution, Columbia University
m.05yyhd4, education.education.institution, Columbia University
m.0104lf16, education.education.institution, Columbia University
m.02wn3m4, education.education.institution, Columbia University
m.02wmqhr, education.education.institution, Columbia University
m.0n1f9_2, education.education.institution, Columbia University
m.06zzjt3, education.education.institution, Columbia University
m.0d8dxr_, education.education.institution, Columbia University
m.04ystr2, education.education.institution, Columbia University
m.02wn4y4, education.education.institution, Columbia University
m.04lnm1y, education.education.institution, Columbia University
m.05y_26z, education.education.institution, Columbia University
m.02wp48_, education.education.institution, Columbia University
m.02wmyht, education.education.institution, Columbia University
m.02wn9d0, education.education.institution, Columbia University
m.02wn0d1, education.education.institution, Columbia University
m.02wpcy9, education.education.institution, Columbia University
m.02wpmr1, education.education.institution, Columbia University
m.02wmvn9, education.education.institution, Columbia University
m.04htgd6, education.education.institution, Columbia University
m.02wpcb8, education.education.institution, Columbia University
m.04q1cl6, education.education.institution, Columbia University
m.0n1jl_3, education.education.institution, Columbia University
m.0hhyg56, education.education.institution, Columbia University
m.09vjdy8, education.education.institution, Columbia University
m.02wnpj8, education.education.institution, Columbia University
m.05y_12l, education.education.institution, Columbia University
m.04dnxdg, education.education.institution, Columbia University
m.04ys_p_, education.education.institution, Columbia University
m.02wnhd9, education.education.institution, Columbia University
m.02wmsn8, education.education.institution, Columbia University
Education reform, event.speech_or_presentation.speech_topic, m.0j31vdq
m.02wn914, education.education.institution, Columbia University
m.05nvwl4, education.education.institution, Columbia University
m.02wpk26, education.education.institution, Columbia University
m.05yysw0, education.education.institution, Columbia University
m.02wmyd4, education.education.institution, Columbia University
m.07ltd5y, education.education.institution, Columbia University
m.03p724b, education.education.institution, Columbia University
m.04lpfwh, education.education.institution, Columbia University
m.0znyc43, education.education.institution, Columbia University
m.07lt0b0, education.education.institution, Columbia University
m.02wpnz4, education.education.institution, Columbia University
m.04htm02, education.education.institution, Columbia University
m.02wmsx1, education.education.institution, Columbia University
m.04fntnq, education.education.institution, Columbia University
m.04hbfm6, education.education.institution, Columbia University
m.02wn2d1, education.education.institution, Columbia University
m.02wn771, education.education.institution, Columbia University
m.02wp014, education.education.institution, Columbia University
m.02wmyh1, education.education.institution, Columbia University
m.04hllds, education.education.institution, Columbia University
m.05y_b40, education.education.institution, Columbia University
m.02wnhz9, education.education.institution, Columbia University
m.0w5h0_f, education.education.institution, Columbia University
m.02wmyz1, education.education.institution, Columbia University
m.09vjkz_, education.education.institution, Columbia University
m.04hwz_3, education.education.institution, Columbia University
m.04lnk97, education.education.institution, Columbia University
m.04hqnd5, education.education.institution, Columbia University
m.0svzb_6, education.education.institution, Columbia University
m.06wlkg7, education.education.institution, Columbia University
m.02wng16, education.education.institution, Columbia University
Left Back: A Century of Failed School Reforms, book.author.works_written, Diane Ravitch
Barack Obama, people.person.education, m.02nqgn2
m.07sk4x4, education.education.institution, Columbia University
m.04hfzh2, education.education.institution, Columbia University
m.02wm_p8, education.education.institution, Columbia University
m.02wmtx0, education.education.institution, Columbia University
m.02wnc03, education.education.institution, Columbia University
m.05yzyp8, education.education.institution, Columbia University
m.04ln_3p, education.education.institution, Columbia University
m.02wmy_g, education.education.institution, Columbia University
m.02wnzz8, education.education.institution, Columbia University
m.05y_4q_, education.education.institution, Columbia University
m.0j31vdq, event.speech_or_presentation.speech_topic, Education reform
m.04hh_29, education.education.institution, Columbia University
m.010f_r_q, education.education.institution, Columbia University
m.05y_48d, education.education.institution, Columbia University
g.11btt5hry1, education.education.institution, Columbia University
m.02wn9_d, education.education.institution, Columbia University
m.02wp3_j, education.education.institution, Columbia University
m.02nqgpk, education.education.institution, Occidental College
m.06wgkl7, education.education.institution, Columbia University
m.02wnms6, education.education.institution, Columbia University
m.03mk_43, education.education.institution, Columbia University
m.05yz24y, education.education.institution, Columbia University
m.04hrr_w, education.education.institution, Columbia University
m.05yyq_c, education.education.institution, Columbia University
m.02wmy4y, education.education.institution, Columbia University
m.010g77_y, education.education.institution, Columbia University
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m.06z_115, education.education.institution, Columbia University
m.06wgmd3, education.education.institution, Columbia University
m.02wnk43, education.education.institution, Columbia University
m.0cplf_3, education.education.institution, Columbia University
m.0gvw8d8, education.education.institution, Columbia University
m.05yytr7, education.education.institution, Columbia University
m.02wmyy3, education.education.institution, Columbia University
m.0j3jdw8, education.education.institution, Columbia University
m.0_tlq_v, education.education.institution, Columbia University
m.03q19g7, education.education.institution, Columbia University
m.03p7203, education.education.institution, Columbia University
m.05t9h56, education.education.institution, Columbia University
m.0fq9bd8, education.education.institution, Columbia University
m.02wpmmh, education.education.institution, Columbia University
m.09vjck3, education.education.institution, Columbia University
m.0ggggd_, education.education.institution, Columbia University
m.05yyht2, education.education.institution, Columbia University
m.02wn8_y, education.education.institution, Columbia University
m.0zwhk_c, education.education.institution, Columbia University
m.05yz0s4, education.education.institution, Columbia University
m.02wnb61, education.education.institution, Columbia University
m.02wnch6, education.education.institution, Columbia University
m.02wnx20, education.education.institution, Columbia University
m.04lnz97, education.education.institution, Columbia University
m.03p72_v, education.education.institution, Columbia University
m.09vjbxt, education.education.institution, Columbia University
m.02wmt68, education.education.institution, Columbia University
m.03p7211, education.education.institution, Columbia University
m.07y4hh5, education.education.institution, Columbia University
m.062yn_5, education.education.institution, Columbia University
m.04hqsn7, education.education.institution, Columbia University
m.02wp1_3, education.education.institution, Columbia University
m.02wmq_w, education.education.institution, Columbia University
m.02wntn0, education.education.institution, Columbia University
m.0j_vg_l, education.education.institution, Columbia University
m.0hnjd21, education.education.institution, Columbia University
m.04hr8cw, education.education.institution, Columbia University
m.049y429, education.education.institution, Columbia University
m.05y_44t, education.education.institution, Columbia University
m.09vjbl7, education.education.institution, Columbia University
m.02wpf49, education.education.institution, Columbia University
m.02wnt12, education.education.institution, Columbia University
m.0svw8w8, education.education.institution, Columbia University
m.0w5dq_6, education.education.institution, Columbia University
m.02wnhn5, education.education.institution, Columbia University
m.02wnvz6, education.education.institution, Columbia University
m.02wps88, education.education.institution, Columbia University
m.06wglt7, education.education.institution, Columbia University
m.05yyfl4, education.education.institution, Columbia University
m.02wp3_f, education.education.institution, Columbia University
m.02wnjx4, education.education.institution, Columbia University
m.05yzm_8, education.education.institution, Columbia University
m.0svxm_f, education.education.institution, Columbia University
m.0w5l9_6, education.education.institution, Columbia University
m.02wnp78, education.education.institution, Columbia University
m.02wpfrb, education.education.institution, Columbia University
m.02wnwv4, education.education.institution, Columbia University
m.03p7367, education.education.institution, Columbia University
m.02wpfqh, education.education.institution, Columbia University
m.0zmvg_p, education.education.institution, Columbia University
m.04yt0j8, education.education.institution, Columbia University
m.02wnr99, education.education.institution, Columbia University
m.04ls7y9, education.education.institution, Columbia University
m.0n18_66, education.education.institution, Columbia University
m.05yyy24, education.education.institution, Columbia University
m.03llz75, education.education.institution, Columbia University
m.02wnd7b, education.education.institution, Columbia University
m.02wnx67, education.education.institution, Columbia University
Barack Obama, people.person.education, m.02nqgpk
m.02wn974, education.education.institution, Columbia University
m.04ysxm1, education.education.institution, Columbia University
m.062yv12, education.education.institution, Columbia University
m.0n41d56, education.education.institution, Columbia University
m.02wn8l_, education.education.institution, Columbia University
m.03p726_, education.education.institution, Columbia University
m.05yy_j7, education.education.institution, Columbia University
m.05yzc17, education.education.institution, Columbia University
m.02wpf13, education.education.institution, Columbia University
m.02wn2l7, education.education.institution, Columbia University
m.04mjbm8, education.education.institution, Columbia University
m.0n0fm28, education.education.institution, Columbia University
m.02wnb89, education.education.institution, Columbia University
m.09j49y1, education.education.institution, Columbia University
m.02wns0y, education.education.institution, Columbia University
m.02wpnr6, education.education.institution, Columbia University
m.02wpm21, education.education.institution, Columbia University
m.02wprs7, education.education.institution, Columbia University
m.02wmt4d, education.education.institution, Columbia University
m.02wpmf9, education.education.institution, Columbia University
m.02wmtb0, education.education.institution, Columbia University
m.02wpfd5, education.education.institution, Columbia University
m.02wnh78, education.education.institution, Columbia University
m.06wghw1, education.education.institution, Columbia University
m.0fq7s_6, education.education.institution, Columbia University
m.02wns24, education.education.institution, Columbia University
m.04q1dt3, education.education.institution, Columbia University
m.02wnrx7, education.education.institution, Columbia University
m.0w5kt_h, education.education.institution, Columbia University
m.02_7jm_, education.education.institution, Columbia University
m.04d0_xv, education.education.institution, Columbia University
m.05yys96, education.education.institution, Columbia University
m.07lgg83, education.education.institution, Columbia University
m.02wnxv9, education.education.institution, Columbia University
m.09vmsh7, education.education.institution, Columbia University
m.02wmzy8, education.education.institution, Columbia University
m.05y_751, education.education.institution, Columbia University
m.02wnz81, education.education.institution, Columbia University
m.04lp8bz, education.education.institution, Columbia University
m.07sklh0, education.education.institution, Columbia University
m.07lt6w9, education.education.institution, Columbia University
m.0ncl_72, education.education.institution, Columbia University
m.02wpfl2, education.education.institution, Columbia University
m.02wptf6, education.education.institution, Columbia University
m.0jzrk66, education.education.institution, Columbia University
m.010vsw_v, education.education.institution, Columbia University
m.02wn7t4, education.education.institution, Columbia University
m.05yyrw7, education.education.institution, Columbia University
m.0j3jd_z, education.education.institution, Columbia University
m.0648qz3, education.education.institution, Columbia University
m.09sc7z2, education.education.institution, Columbia University
m.02wpm73, education.education.institution, Columbia University
m.062yz41, education.education.institution, Columbia University
m.02wpf40, education.education.institution, Columbia University
m.06wgh74, education.education.institution, Columbia University
m.0w59_82, education.education.institution, Columbia University
m.04lp7y8, education.education.institution, Columbia University
m.06wk2y5, education.education.institution, Columbia University
m.05yz890, education.education.institution, Columbia University
m.02wn5_4, education.education.institution, Columbia University
m.0wl4h36, education.education.institution, Columbia University
m.02wmtk4, education.education.institution, Columbia University
m.05yzqn8, education.education.institution, Columbia University
m.062yx76, education.education.institution, Columbia University
m.067lcb7, education.education.institution, Columbia University
m.02wn8f8, education.education.institution, Columbia University
m.02wnq_8, education.education.institution, Columbia University
m.0fpkyz7, education.education.institution, Columbia University
m.0sv_r_v, education.education.institution, Columbia University
m.05y_102, education.education.institution, Columbia University
m.062yv_f, education.education.institution, Columbia University
m.02wn207, education.education.institution, Columbia University
m.02wpf76, education.education.institution, Columbia University
m.04hbdn_, education.education.institution, Columbia University
m.0d8y_q7, education.education.institution, Columbia University
m.04md9lt, education.education.institution, Columbia University
m.03p7216, education.education.institution, Columbia University
m.09vjnk7, education.education.institution, Columbia University
m.07049_y, education.education.institution, Columbia University
m.09vjll7, education.education.institution, Columbia University
m.07ss3q8, education.education.institution, Columbia University
m.04lnh8w, education.education.institution, Columbia University
m.0dl9_xx, education.education.institution, Columbia University
m.02wnj8_, education.education.institution, Columbia University
m.09vjp40, education.education.institution, Columbia University
m.0dfgym1, education.education.institution, Columbia University
m.02wn6_n, education.education.institution, Columbia University
m.05y_fx6, education.education.institution, Columbia University
m.04m21zw, education.education.institution, Columbia University
m.02wnjf9, education.education.institution, Columbia University
m.0j31vdq, event.public_speaker.speeches_or_presentations, Barack Obama

Answer: Harvard Law School
Columbia University
Occidental College