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Trivial answer. Returns arg or ¯arg.
arg
¯arg
Saved 10 bytes by not being dumb (thanks Adám).
Altered the resulting 3-byter to a more fitting function.
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Trivial answer. Returns arg-0 or 0-arg¯arg.
arg-0
0-arg¯arg
(⊢-∘0)⍝)⊢-∘0(
Trivial answer. Returns arg-0 or 0-arg.
0-arg
