BEST_CASE(Omega(n^1),?)

Solution:
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  "0" :: [] -(0)-> "Nat"(0)
  "0" :: [] -(1)-> "Nat"(1)
  "d" :: ["Nat"(0)] -(1)-> "Nat"(0)
  "exp" :: ["Nat"(1)] -(0)-> "Nat"(0)
  "s" :: ["Nat"(0)] -(0)-> "Nat"(0)
  "s" :: ["Nat"(1)] -(1)-> "Nat"(1)


Cost Free Signatures:
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Base Constructors:
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  "\"0\"_Nat" :: [] -(1)-> "Nat"(1)
  "\"s\"_Nat" :: ["Nat"(1)] -(1)-> "Nat"(1)