WORST_CASE(?,O(n^2))

Solution:
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  "+" :: ["A"(0, 0) x "A"(2, 0)] -(1)-> "A"(0, 0)
  "0" :: [] -(0)-> "A"(6, 6)
  "0" :: [] -(0)-> "A"(6, 0)
  "0" :: [] -(0)-> "A"(2, 0)
  "0" :: [] -(0)-> "A"(0, 0)
  "double" :: ["A"(6, 0)] -(1)-> "A"(2, 0)
  "s" :: ["A"(12, 6)] -(6)-> "A"(6, 6)
  "s" :: ["A"(6, 0)] -(6)-> "A"(6, 0)
  "s" :: ["A"(2, 0)] -(2)-> "A"(2, 0)
  "s" :: ["A"(0, 0)] -(0)-> "A"(0, 0)
  "sqr" :: ["A"(6, 6)] -(1)-> "A"(0, 0)


Cost Free Signatures:
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  "+" :: ["A"_cf(0, 0) x "A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "+" :: ["A"_cf(0, 0) x "A"_cf(0, 0)] -(1)-> "A"_cf(0, 0)
  "0" :: [] -(0)-> "A"_cf(0, 0)
  "0" :: [] -(0)-> "A"_cf(1, 1)
  "double" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "double" :: ["A"_cf(0, 0)] -(1)-> "A"_cf(0, 0)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "sqr" :: ["A"_cf(0, 0)] -(1)-> "A"_cf(0, 0)
  "sqr" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)


Base Constructors:
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