WORST_CASE(?,O(n^1)) Solution: --------- "0" :: [] -(0)-> "A"(0) "0" :: [] -(0)-> "A"(2) "S" :: ["A"(0)] -(0)-> "A"(0) "S" :: ["A"(2)] -(2)-> "A"(2) "dbl" :: ["A"(0) x "A"(0)] -(1)-> "A"(0) "save" :: ["A"(2)] -(1)-> "A"(0) Cost Free Signatures: --------------------- "0" :: [] -(0)-> "A"_cf(0) "S" :: ["A"_cf(0)] -(0)-> "A"_cf(0) "dbl" :: ["A"_cf(0) x "A"_cf(0)] -(0)-> "A"_cf(0) "save" :: ["A"_cf(0)] -(0)-> "A"_cf(0) Base Constructors: ------------------