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X1 x2 x3 x4 2
X1 x2 x3 x4 2 pictures 5
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X1 x2 x3
X1 x2 x3 x4 2
x1 x2 x3 x4+ xn 2
calculati x1 2 x2 2 x3 2 x4 2
x1 x2 x3 x4 x5 2
x1 x2 x3 x4+ xn 2 formula
the constraint x1 x2 x3 x4 2
x1 x2 x3 x4 2