A natural cubic spline S(x) on the interval 0≤x≤2 is defined by S(x) | S (x) 0≤x≤1 = |S₁₂ (x) 1≤x≤2 If So(x)=1+12x-2x3 and S1(x) = p + b (x-1) + c (x-1)² + d (x-1)3 then p² + b² + c² + d =

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