WORST_CASE(?,O(n^2))

Solution:
---------

  "0" :: [] -(0)-> "A"(3, 3)
  "0" :: [] -(0)-> "A"(6, 3)
  "0" :: [] -(0)-> "A"(15, 15)
  "a__add" :: ["A"(3, 3) x "A"(6, 3)] -(4)-> "A"(3, 3)
  "a__from" :: ["A"(6, 3)] -(5)-> "A"(3, 3)
  "a__fst" :: ["A"(3, 3) x "A"(6, 3)] -(4)-> "A"(3, 3)
  "a__len" :: ["A"(3, 3)] -(5)-> "A"(3, 3)
  "add" :: ["A"(6, 3) x "A"(9, 3)] -(6)-> "A"(6, 3)
  "add" :: ["A"(0, 0) x "A"(0, 0)] -(0)-> "A"(0, 0)
  "add" :: ["A"(3, 3) x "A"(6, 3)] -(3)-> "A"(3, 3)
  "cons" :: ["A"(6, 3) x "A"(0, 0)] -(6)-> "A"(6, 3)
  "cons" :: ["A"(3, 3) x "A"(0, 0)] -(3)-> "A"(3, 3)
  "from" :: ["A"(9, 3)] -(6)-> "A"(6, 3)
  "from" :: ["A"(0, 0)] -(0)-> "A"(0, 0)
  "from" :: ["A"(6, 3)] -(3)-> "A"(3, 3)
  "fst" :: ["A"(6, 3) x "A"(9, 3)] -(6)-> "A"(6, 3)
  "fst" :: ["A"(0, 0) x "A"(0, 0)] -(0)-> "A"(0, 0)
  "fst" :: ["A"(3, 3) x "A"(6, 3)] -(3)-> "A"(3, 3)
  "len" :: ["A"(6, 3)] -(6)-> "A"(6, 3)
  "len" :: ["A"(0, 0)] -(0)-> "A"(0, 0)
  "len" :: ["A"(3, 3)] -(3)-> "A"(3, 3)
  "mark" :: ["A"(6, 3)] -(1)-> "A"(3, 3)
  "nil" :: [] -(0)-> "A"(3, 3)
  "nil" :: [] -(0)-> "A"(6, 3)
  "nil" :: [] -(0)-> "A"(3, 15)
  "nil" :: [] -(0)-> "A"(15, 15)
  "s" :: ["A"(0, 0)] -(0)-> "A"(3, 3)
  "s" :: ["A"(0, 0)] -(0)-> "A"(6, 3)
  "s" :: ["A"(0, 0)] -(0)-> "A"(0, 0)
  "s" :: ["A"(0, 0)] -(0)-> "A"(9, 7)
  "s" :: ["A"(0, 0)] -(0)-> "A"(3, 8)
  "s" :: ["A"(0, 0)] -(0)-> "A"(11, 11)


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

  "0" :: [] -(0)-> "A"_cf(0, 0)
  "0" :: [] -(0)-> "A"_cf(3, 0)
  "0" :: [] -(0)-> "A"_cf(8, 8)
  "0" :: [] -(0)-> "A"_cf(15, 12)
  "0" :: [] -(0)-> "A"_cf(7, 0)
  "0" :: [] -(0)-> "A"_cf(15, 0)
  "0" :: [] -(0)-> "A"_cf(8, 0)
  "a__add" :: ["A"_cf(0, 0) x "A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "a__add" :: ["A"_cf(3, 0) x "A"_cf(3, 0)] -(3)-> "A"_cf(3, 0)
  "a__from" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "a__from" :: ["A"_cf(3, 0)] -(3)-> "A"_cf(3, 0)
  "a__fst" :: ["A"_cf(0, 0) x "A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "a__fst" :: ["A"_cf(3, 0) x "A"_cf(3, 0)] -(3)-> "A"_cf(3, 0)
  "a__len" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "a__len" :: ["A"_cf(3, 0)] -(3)-> "A"_cf(3, 0)
  "add" :: ["A"_cf(0, 0) x "A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "add" :: ["A"_cf(3, 0) x "A"_cf(3, 0)] -(3)-> "A"_cf(3, 0)
  "cons" :: ["A"_cf(0, 0) x "A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "cons" :: ["A"_cf(3, 0) x "A"_cf(0, 0)] -(3)-> "A"_cf(3, 0)
  "from" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "from" :: ["A"_cf(3, 0)] -(3)-> "A"_cf(3, 0)
  "fst" :: ["A"_cf(0, 0) x "A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "fst" :: ["A"_cf(3, 0) x "A"_cf(3, 0)] -(3)-> "A"_cf(3, 0)
  "len" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "len" :: ["A"_cf(3, 0)] -(3)-> "A"_cf(3, 0)
  "mark" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "mark" :: ["A"_cf(3, 0)] -(0)-> "A"_cf(3, 0)
  "nil" :: [] -(0)-> "A"_cf(0, 0)
  "nil" :: [] -(0)-> "A"_cf(3, 0)
  "nil" :: [] -(0)-> "A"_cf(12, 12)
  "nil" :: [] -(0)-> "A"_cf(8, 1)
  "nil" :: [] -(0)-> "A"_cf(14, 0)
  "nil" :: [] -(0)-> "A"_cf(15, 5)
  "nil" :: [] -(0)-> "A"_cf(9, 0)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 0)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(3, 0)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(0, 1)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(10, 8)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(12, 14)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(4, 0)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(5, 1)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(9, 8)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(11, 9)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(8, 0)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(14, 12)
  "s" :: ["A"_cf(0, 0)] -(0)-> "A"_cf(10, 6)


Base Constructors:
------------------
  "\"0\"_A" :: [] -(0)-> "A"(1, 0)
  "\"0\"_A" :: [] -(0)-> "A"(0, 1)
  "\"add\"_A" :: ["A"(1, 0) x "A"(1, 0)] -(1)-> "A"(1, 0)
  "\"add\"_A" :: ["A"(0, 1) x "A"(1, 1)] -(0)-> "A"(0, 1)
  "\"cons\"_A" :: ["A"(1, 0) x "A"(0, 0)] -(1)-> "A"(1, 0)
  "\"cons\"_A" :: ["A"(0, 1) x "A"(0, 0)] -(0)-> "A"(0, 1)
  "\"from\"_A" :: ["A"(1, 0)] -(1)-> "A"(1, 0)
  "\"from\"_A" :: ["A"(1, 1)] -(0)-> "A"(0, 1)
  "\"fst\"_A" :: ["A"(1, 0) x "A"(1, 0)] -(1)-> "A"(1, 0)
  "\"fst\"_A" :: ["A"(0, 1) x "A"(1, 1)] -(0)-> "A"(0, 1)
  "\"len\"_A" :: ["A"(1, 0)] -(1)-> "A"(1, 0)
  "\"len\"_A" :: ["A"(0, 1)] -(0)-> "A"(0, 1)
  "\"nil\"_A" :: [] -(0)-> "A"(1, 0)
  "\"nil\"_A" :: [] -(0)-> "A"(0, 1)
  "\"s\"_A" :: ["A"(0, 0)] -(0)-> "A"(1, 0)
  "\"s\"_A" :: ["A"(0, 0)] -(0)-> "A"(0, 1)