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Let
F
be a monadic link.FƘ
is a dyad that maps (x, y) to [t for t in x if F(t) == y].So,
…LƘ4
means “filter to elements whoseL
ength is 4”.This is a shorter way to write
…L=¥Ƈ4
or…L=4ƊƇ
.