I tried to diagram the premise in this question and I get R-->BOC. I picked an Idea "not rational" and negated it and made it the sufficient. But this is quite different from what you give in the video explanation (not BOC -->R) . What am I doing wrong? HELP http://7sage.com/lsat_explanations/lsat-64-section-3-question-26/
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[Video explanation of the question here: http://7sage.com/lsat_explanations/lsat-64-section-3-question-26/]