(STRATEGY
    INNERMOST)

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