MAYBE MAYBE TRS: { f(x, y, g(z)) -> g(f(x, y, z)), f(x, g(y), z) -> g(f(x, y, z)), f(g(x), y, z) -> g(f(x, y, z)), f(0(), 1(), x) -> f(g(x), g(x), x) } DUP: We consider a duplicating system. Trs: { f(x, y, g(z)) -> g(f(x, y, z)), f(x, g(y), z) -> g(f(x, y, z)), f(g(x), y, z) -> g(f(x, y, z)), f(0(), 1(), x) -> f(g(x), g(x), x) } Fail