(VAR x y z )
(RULES 
        f(0, 1, x) -> f(g(x), g(x), x)
        f(g(x), y, z) -> g(f(x, y, z))
        f(x, g(y), z) -> g(f(x, y, z))
        f(x, y, g(z)) -> g(f(x, y, z))
        
)