42件のコメント http://b.hatena.ne.jp/entry/s/togetter.com/li/1098244#tw?u=ubnt_intrepid … “まさかのNP困難?「九九って36種類しか数がないの不思議だよな」から始まる数学談義 - Togetterまとめ” http://htn.to/m6RTBM
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