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X2 1 2
x2 1 2 integration
x2 1 2 4 2x 1
x2 1 2 x 2 0
x2 1 2 x 3
x2 1 2 y2 1 2
x2 1 2 3
x2 1 2 3x2
x2 1 2 has
x2 1 2 x 2
x2 1 2 x2 0 has
