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[λ] /prog/ challenge -1 [λ]

Name: Anonymous 2012-08-07 19:21

Write a function f where for any integer x, x + 1 = f(f(f(x))), but x, f(x) and f(f(x)) are mutually different.

Name: Anonymous 2012-08-08 8:02

I think >>1 means this:
∀x∈Z: x+1=f(f(f(x))) ∧ x≠f(x) ∧ x≠f(f(x)) ∧ f(x)≠f(f(x))

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