/home/nowonder/forschung/aprove/TPDB05/TRS/Zantema/z21.trs

The program

(VAR x y z)
(RULES
f(f(a,b),x) -> f(a,f(a,x))
f(f(b,a),x) -> f(b,f(b,x))
f(x,f(y,z)) -> f(f(x,y),z)
)
(COMMENT: TRS variant of ab -> aa, ba -> bb )

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