(STRATEGY
    INNERMOST)

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