WORST_CASE(?,O(n^2))

Solution:
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  "-" :: ["A"(4, 4) x "A"(0, 0)] -(1)-> "A"(4, 4)
  "0" :: [] -(0)-> "A"(0, 0)
  "0" :: [] -(0)-> "A"(4, 4)
  "0" :: [] -(0)-> "A"(4, 0)
  "div" :: ["A"(4, 4) x "A"(0, 0)] -(1)-> "A"(0, 0)
  "false" :: [] -(0)-> "A"(0, 0)
  "if" :: ["A"(0, 0) x "A"(0, 0) x "A"(0, 0)] -(1)-> "A"(0, 0)
  "lt" :: ["A"(4, 0) x "A"(0, 0)] -(1)-> "A"(0, 0)
  "s" :: ["A"(0, 0)] -(0)-> "A"(0, 0)
  "s" :: ["A"(8, 4)] -(4)-> "A"(4, 4)
  "s" :: ["A"(4, 0)] -(4)-> "A"(4, 0)
  "true" :: [] -(0)-> "A"(0, 0)


Cost Free Signatures:
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Base Constructors:
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