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+import nat
+import prelude
+
+fib : Integer -> Integer
+fib 0 = 1
+fib 1 = 1
+fib n = fib (n-1) + fib (n-2)
+
+fibNat : Nat -> Nat
+fibNat Zero = Succ Zero
+fibNat (Succ Zero) = Succ Zero
+fibNat (Succ (Succ n)) = plus Nat add_Nat (fibNat (Succ n)) (fibNat n) \ No newline at end of file