WORST_CASE(?,O(n^2))

Solution:
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  c :: [A(1, 0) x A(0, 0)] -(0)-> A(1, 0)
  c :: [A(0, 0) x A(1, 0)] -(0)-> A(0, 1)
  f :: [A(1, 0)] -(0)-> A(0, 0)
  g :: [A(0, 1)] -(0)-> A(0, 0)
  s :: [A(1, 0)] -(1)-> A(1, 0)
  s :: [A(0, 0)] -(0)-> A(0, 0)


Cost Free Signatures:
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  c :: [A_cf(0, 0) x A_cf(0, 0)] -(0)-> A_cf(0, 0)
  f :: [A_cf(0, 0)] -(0)-> A_cf(0, 0)
  g :: [A_cf(0, 0)] -(0)-> A_cf(0, 0)
  s :: [A_cf(0, 0)] -(0)-> A_cf(0, 0)