(STRATEGY
    INNERMOST)

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