WORST_CASE(?,O(n^1))

Solution:
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  f :: [A(1)] -(0)-> A(0)
  g :: [A(1)] -(1)-> A(1)


Cost Free Signatures:
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  f :: [A_cf(0)] -(0)-> A_cf(0)
  g :: [A_cf(0)] -(0)-> A_cf(0)