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Monadic rc
Reference count of x
Syntax: rc <x>; rc[<x>]
o)a: 1 2 3
1 2 3
o)rc[a]
1
o)b:a
1 2 3
o)rc[a]
2
o)l:(a;b)
1 2 3
1 2 3
o)rc[a]
4
o)l:()
()
o)rc[a]
2
o)