WORST_CASE(?,O(n^1))

Solution:
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  "cons" :: ["A"(0) x "A"(12)] -(12)-> "A"(12)
  "cons" :: ["A"(0) x "A"(2)] -(2)-> "A"(2)
  "empty" :: [] -(0)-> "A"(12)
  "empty" :: [] -(0)-> "A"(14)
  "r1" :: ["A"(12) x "A"(2)] -(13)-> "A"(2)
  "rev" :: ["A"(14)] -(16)-> "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)