/home/nowonder/forschung/aprove/TPDB05/TRS/Zantema/z18.trs

The program

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

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