2. Consider a natural cubic spline model with two knots at ci and c2 given by y = Bo + B1r+ B2(r - c1) + Ba(r - ce2) +, where B2 + Ba = 0 and Bac1 + B3c2 = 0. Let f(r) = Bo + Bir + B2(r - c1) + Ba(r - c2) Assume that ci C2.

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