WORST_CASE(?,O(n^1))

Solution:
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  "Cons" :: ["A"(3) x "A"(3)] -(3)-> "A"(3)
  "Cons" :: ["A"(0) x "A"(0)] -(0)-> "A"(0)
  "Nil" :: [] -(0)-> "A"(3)
  "Nil" :: [] -(0)-> "A"(0)
  "duplicate" :: ["A"(3)] -(1)-> "A"(0)
  "goal" :: ["A"(15)] -(8)-> "A"(0)


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