BEST_CASE(Omega(n^1),?)

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


Cost Free Signatures:
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