EQUATIONS: 
f(x,f(y,z)) = f(f(x,y),z)
f(x,i(x)) = e()
f(x,e()) = x

COMPLETE TRS:
RULES:
f(x,i(x)) -> e()
f(x,e()) -> x
f(e(),x) -> x
f(i(x),x) -> e()
f(i(x),f(x,y)) -> y
f(f(x,y),z) -> f(x,f(y,z))
f(y,f(i(y),x)) -> x
i(e()) -> e()
i(i(x)) -> x
i(f(y,x)) -> f(i(x),i(y))

SUCCESS
MaxTRS: 2 
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