WORST_CASE(?,O(n^2))

Solution:
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  "0" :: [] -(0)-> "A"(0, 0)
  "0" :: [] -(0)-> "A"(1, 0)
  "0" :: [] -(0)-> "A"(4, 2)
  "0" :: [] -(0)-> "A"(2, 2)
  "false" :: [] -(0)-> "A"(0, 0)
  "gcd" :: ["A"(4, 2) x "A"(2, 2)] -(1)-> "A"(0, 0)
  "if_gcd" :: ["A"(0, 0) x "A"(2, 2) x "A"(2, 2)] -(1)-> "A"(0, 0)
  "le" :: ["A"(0, 0) x "A"(1, 0)] -(1)-> "A"(0, 0)
  "minus" :: ["A"(4, 2) x "A"(0, 0)] -(1)-> "A"(4, 2)
  "s" :: ["A"(0, 0)] -(0)-> "A"(0, 0)
  "s" :: ["A"(1, 0)] -(1)-> "A"(1, 0)
  "s" :: ["A"(6, 2)] -(4)-> "A"(4, 2)
  "s" :: ["A"(4, 2)] -(2)-> "A"(2, 2)
  "true" :: [] -(0)-> "A"(0, 0)


Cost Free Signatures:
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Base Constructors:
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