WORST_CASE(?,O(n^1))

Solution:
---------

  "0" :: [] -(0)-> "Nat"(15)
  "checkF" :: ["Q"(3)] -(4)-> "Q"(3)
  "cons" :: ["Nat"(0) x "L"(1)] -(1)-> "L"(1)
  "cons" :: ["Nat"(0) x "L"(0)] -(0)-> "L"(0)
  "cons" :: ["Nat"(0) x "L"(3)] -(3)-> "L"(3)
  "empty" :: [] -(12)-> "Q"(5)
  "enq" :: ["Nat"(15)] -(13)-> "Q"(3)
  "errorHead" :: [] -(0)-> "Nat"(7)
  "errorTail" :: [] -(0)-> "Q"(7)
  "head" :: ["Q"(4)] -(8)-> "Nat"(0)
  "nil" :: [] -(0)-> "L"(1)
  "nil" :: [] -(0)-> "L"(0)
  "nil" :: [] -(0)-> "L"(7)
  "nil" :: [] -(0)-> "L"(15)
  "queue" :: ["L"(0) x "L"(3)] -(3)-> "Q"(3)
  "queue" :: ["L"(0) x "L"(4)] -(4)-> "Q"(4)
  "queue" :: ["L"(0) x "L"(7)] -(7)-> "Q"(7)
  "rev" :: ["L"(1)] -(3)-> "L"(0)
  "rev'" :: ["L"(1) x "L"(0)] -(2)-> "L"(0)
  "s" :: ["Nat"(15)] -(15)-> "Nat"(15)
  "snoc" :: ["Q"(3) x "Nat"(0)] -(9)-> "Q"(3)
  "tail" :: ["Q"(3)] -(9)-> "Q"(0)


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

  "0" :: [] -(0)-> "Nat"_cf(0)
  "checkF" :: ["Q"_cf(0)] -(0)-> "Q"_cf(0)
  "cons" :: ["Nat"_cf(0) x "L"_cf(0)] -(0)-> "L"_cf(0)
  "empty" :: [] -(0)-> "Q"_cf(0)
  "enq" :: ["Nat"_cf(0)] -(0)-> "Q"_cf(0)
  "nil" :: [] -(0)-> "L"_cf(0)
  "queue" :: ["L"_cf(0) x "L"_cf(0)] -(0)-> "Q"_cf(0)
  "rev" :: ["L"_cf(0)] -(0)-> "L"_cf(0)
  "rev'" :: ["L"_cf(0) x "L"_cf(0)] -(0)-> "L"_cf(0)
  "s" :: ["Nat"_cf(0)] -(0)-> "Nat"_cf(0)
  "snoc" :: ["Q"_cf(0) x "Nat"_cf(0)] -(0)-> "Q"_cf(0)


Base Constructors:
------------------
  "\"0\"_Nat" :: [] -(0)-> "Nat"(1)
  "\"cons\"_L" :: ["Nat"(0) x "L"(1)] -(1)-> "L"(1)
  "\"errorHead\"_Nat" :: [] -(0)-> "Nat"(1)
  "\"errorTail\"_Q" :: [] -(0)-> "Q"(1)
  "\"nil\"_L" :: [] -(0)-> "L"(1)
  "\"queue\"_Q" :: ["L"(0) x "L"(1)] -(1)-> "Q"(1)
  "\"s\"_Nat" :: ["Nat"(1)] -(1)-> "Nat"(1)