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Beats the previous APL answer by one byte, while being aA traditional style APL function, so iteven works on all versions of APL that ever existedlegacy APLs.
APL, 6 bytes
f →⍞←1
Beats the previous APL answer by one byte, while being a traditional style APL function, so it works on all versions of APL that ever existed.
APL, 6 4 bytes
→⍞←1
A traditional style APL function, so even works on all legacy APLs.
