BEST_CASE(Omega(n^1),?)

Solution:
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  "cons" :: ["a"(0) x "a"(2)] -(2)-> "a"(2)
  "cons" :: ["a"(0) x "a"(0)] -(0)-> "a"(0)
  "empty" :: [] -(0)-> "a"(2)
  "f" :: ["a"(2) x "a"(0)] -(1)-> "a"(0)
  "g" :: ["a"(2) x "a"(0) x "a"(0)] -(2)-> "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)