WORST_CASE(?,O(n^1))

Solution:
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  "append" :: ["A"(12) x "A"(14)] -(3)-> "A"(1)
  "cons" :: ["A"(0) x "A"(0)] -(0)-> "A"(0)
  "cons" :: ["A"(15) x "A"(15)] -(15)-> "A"(15)
  "cons" :: ["A"(11) x "A"(11)] -(11)-> "A"(11)
  "cons" :: ["A"(12) x "A"(12)] -(12)-> "A"(12)
  "cons" :: ["A"(1) x "A"(1)] -(1)-> "A"(1)
  "false" :: [] -(0)-> "A"(14)
  "hd" :: ["A"(15)] -(9)-> "A"(7)
  "ifappend" :: ["A"(0) x "A"(14) x "A"(12)] -(2)-> "A"(1)
  "is_empty" :: ["A"(0)] -(12)-> "A"(3)
  "nil" :: [] -(0)-> "A"(0)
  "nil" :: [] -(0)-> "A"(12)
  "tl" :: ["A"(11)] -(13)-> "A"(3)
  "true" :: [] -(0)-> "A"(13)


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




Base Constructors:
------------------
  "\"cons\"_A" :: ["A"(1) x "A"(1)] -(1)-> "A"(1)
  "\"false\"_A" :: [] -(0)-> "A"(1)
  "\"nil\"_A" :: [] -(0)-> "A"(1)
  "\"true\"_A" :: [] -(0)-> "A"(1)