(GOAL COMPLEXITY)
(STARTTERM CONSTRUCTORBASED)
(VAR x y )
(STRATEGY INNERMOST)
(RULES 
        a(a(f(x, y))) -> f(a(b(a(b(a(x))))), a(b(a(b(a(y))))))
        f(a(x), a(y)) -> a(f(x, y))
        f(b(x), b(y)) -> b(f(x, y))
        
)