(STRATEGY
    INNERMOST)

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