(STRATEGY
    INNERMOST)

(VAR
    x y)
(DATATYPES
    A = µX.< 0, s(X) >)
(SIGNATURES
    f :: [A x A] -> A
    g :: [A x A] -> A)
(RULES
    f(x,0()) -> s(0())
    f(s(x),s(y)) -> s(f(x,y))
    g(0(),x) -> g(f(x,x),x))