(GOAL COMPLEXITY)
(STARTTERM CONSTRUCTOR-BASED)
(STRATEGY INNERMOST)
(STRATEGY
    INNERMOST)

(VAR
    x y)
(DATATYPES
    A = µX.< a(X), b(X) >)
(SIGNATURES
    f :: [A x A] -> A)
(RULES
    f(x,a(a(b(b(y))))) ->
      f(a(a(a(b(b(b(x)))))),y)
    f(a(x),y) -> f(x,a(y))
    f(b(x),y) -> f(x,b(y)))