WORST_CASE(?,O(n^1))

Solution:
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  "Cons" :: ["A"(0) x "A"(13)] -(13)-> "A"(13)
  "Cons" :: ["A"(0) x "A"(0)] -(0)-> "A"(0)
  "Nil" :: [] -(0)-> "A"(13)
  "Nil" :: [] -(0)-> "A"(0)
  "duplicate" :: ["A"(13)] -(1)-> "A"(0)
  "goal" :: ["A"(15)] -(15)-> "A"(0)


Cost Free Signatures:
---------------------

  "Cons" :: ["A"_cf(0) x "A"_cf(0)] -(0)-> "A"_cf(0)
  "Nil" :: [] -(0)-> "A"_cf(0)
  "duplicate" :: ["A"_cf(0)] -(0)-> "A"_cf(0)


Base Constructors:
------------------
  "\"Cons\"_A" :: ["A"(0) x "A"(1)] -(1)-> "A"(1)
  "\"Nil\"_A" :: [] -(0)-> "A"(1)