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