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X x2 x3 x4 x5 x6
X x2 x3 x4 x5 x6 pictures 5
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X x2 x3 x4 x5
X x2 x3 x4 x5 x6
x6 x5 x4 x3 x2 x 1
x7 x6 x5 x4 x3 x2 x 1
x6 x5 x4 x3 x2 x 1 0
x+x2+x3+x4+x5+x6 formula
x x2 x3 x4 x5 x6 xn
x x2 x3 x4 x5 x6