(VAR x )
(STRATEGY OUTERMOST)
(RULES 
        a -> f(a)
        a -> g(a)
        f(f(f(x))) -> b
        g(g(g(x))) -> b
        g(f(f(g(x)))) -> b
        f(g(g(f(x)))) -> b
        g(f(g(f(x)))) -> b
        
)