WORST_CASE(?,O(n^2))

Solution:
---------

  "0" :: [] -(0)-> "Nat"(1, 0)
  "0" :: [] -(0)-> "Nat"(2, 2)
  "0" :: [] -(0)-> "Nat"(0, 0)
  "add" :: ["Nat"(1, 0) x "Nat"(0, 0)] -(1)-> "Nat"(0, 0)
  "mult" :: ["Nat"(2, 2) x "Nat"(0, 0)] -(1)-> "Nat"(0, 0)
  "s" :: ["Nat"(1, 0)] -(1)-> "Nat"(1, 0)
  "s" :: ["Nat"(4, 2)] -(2)-> "Nat"(2, 2)
  "s" :: ["Nat"(0, 0)] -(0)-> "Nat"(0, 0)


Cost Free Signatures:
---------------------