論理積 &&
x && y :左辺も右辺もtrueの場合にtrue(左辺 かつ 右辺)
論理和 ||
x || y :左辺か右辺のどちらかがtrueの場合にtrue(左辺 または 右辺)
論理否定 !
!x :xがtrueの場合にfalse、xがfalseの場合にtrue
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