BEST_CASE(Omega(n^1),?)

Solution:
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  "Cons" :: ["A"(0) x "A"(1)] -(1)-> "A"(1)
  "Cons" :: ["A"(0) x "A"(0)] -(0)-> "A"(0)
  "Nil" :: [] -(0)-> "A"(1)
  "Nil" :: [] -(0)-> "A"(0)
  "fleft_op_e_xs_1" :: [] -(0)-> "A"(0)
  "foldr#3" :: ["A"(1)] -(1)-> "A"(0)
  "main" :: ["A"(1)] -(1)-> "A"(0)
  "rev_l" :: [] -(0)-> "A"(0)
  "rev_l#2" :: ["A"(0) x "A"(0)] -(1)-> "A"(0)
  "step_x_f" :: ["A"(0) x "A"(0) x "A"(0)] -(0)-> "A"(0)
  "step_x_f#1" :: ["A"(0) x "A"(0) x "A"(0) x "A"(0)] -(1)-> "A"(0)


Cost Free Signatures:
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