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X x2 x3
X x2 x3 pictures 5
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X x2
X x2 x3
1 x x2 x3 x4
x x2 x3 2
x x2 x3 3
x x2 x3 1
x x2 x3+ xn
x x2 x3 x4 x5 x6
x x2 x3
x x2 x3 x4 formula
x x2 x3 graph
x x2 x3 x4
