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2 1 2 1 0
2 1 2 1 0 pictures 5
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2 1 2 1 0
2 2x 1 3 * 2 x 1 0
0 1 2 4 1 2
1 4 2x 1 2 2 0
2 1 0 1 2 3
if a 2 0 1 2 1 3
2 x 1 )+ 2 3x 1 )u003d 0
2 0 2 1 2 n 1 formula
if a 1 0 2 0 2 1
x 2 1 2 1 0
2 1 2 1 0
