WORST_CASE(?,O(n^0))

Solution:
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  "app" :: ["A"(0) x "A"(0)] -(1)-> "A"(0)
  "cons" :: ["A"(0)] -(0)-> "A"(0)
  "from" :: ["A"(0)] -(1)-> "A"(0)
  "nil" :: [] -(0)-> "A"(0)
  "prefix" :: ["A"(0)] -(1)-> "A"(0)
  "zWadr" :: ["A"(0) x "A"(0)] -(2)-> "A"(0)


Cost Free Signatures:
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Base Constructors:
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