(STRATEGY
    INNERMOST)

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