BEST_CASE(Omega(n^1),?)

Solution:
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  "@" :: ["b"(0) x "b"(0)] -(1)-> "b"(0)
  "dd" :: ["a"(0) x "b"(0)] -(0)-> "b"(0)
  "dd" :: ["a"(0) x "b"(1)] -(1)-> "b"(1)
  "nil" :: [] -(0)-> "b"(0)
  "nil" :: [] -(0)-> "b"(1)
  "rev" :: ["b"(1)] -(1)-> "b"(0)


Cost Free Signatures:
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Base Constructors:
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  "\"dd\"_b" :: ["a"(0) x "b"(1)] -(1)-> "b"(1)
  "\"nil\"_b" :: [] -(0)-> "b"(1)