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

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

SUCCESS
MaxTRS: 2 
Search time: 0.17 seconds