WORST_CASE(?,O(n^1))

Solution:
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  "cons" :: ["a"(0) x "a"(3)] -(3)-> "a"(3)
  "cons" :: ["a"(0) x "a"(0)] -(0)-> "a"(0)
  "empty" :: [] -(0)-> "a"(3)
  "f" :: ["a"(3) x "a"(0)] -(13)-> "a"(0)
  "g" :: ["a"(3) x "a"(0) x "a"(0)] -(15)-> "a"(0)


Cost Free Signatures:
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Base Constructors:
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  "\"cons\"_a" :: ["a"(0) x "a"(1)] -(1)-> "a"(1)
  "\"empty\"_a" :: [] -(0)-> "a"(1)