/home/nowonder/forschung/aprove/TPDB05/TRS/Zantema/z06.trs

The program

(VAR x)
(RULES
f(a,f(b,x)) -> f(a,f(a,f(a,x)))
f(b,f(a,x)) -> f(b,f(b,f(b,x)))
)

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