こういうやつ
not (a or b or c) <=> (not a) and (not b) and (not c)
not (a and b and c) <=> (not a) or (not b) or (not c)
すぐ忘れるよね。ぼくは忘れる。
O'Reillyの『リーダブルコード』に簡単な覚え方が載っていた。
notを分配してand/orを反転する
(逆方向は「notをくくりだす」)
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