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I. Write a scheme function (tribonacci n). The tribonacci numbers Ti are defined as T 0 = T 1 = 0, T 2 = 1,

I. Write a scheme function (tribonacci n). The tribonacci numbers Ti are defined as T0 = T1 = 0, T2 = 1, and TN = TN-1 + TN-2 + TN-3. (tribonacci n) should return Tn. tribonacci and any helper functions must be tail recursive.

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