(GOAL COMPLEXITY)
(STARTTERM CONSTRUCTORBASED)
(VAR x y )
(STRATEGY INNERMOST)
(RULES 
        dbl(S(0), S(0)) -> S(S(S(S(0))))
        unsafe(S(x)) -> dbl(unsafe(x), 0)
        unsafe(0) -> 0
        dbl(0, y) -> y
        
)