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2 1 2 1 2 0
2 1 2 1 2 0 pictures 5
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2 1 2 1 2 0
0 2 ( u0445 2 )u003d 1 2 2 1 2
1 1 2 0 5 x 2 1 2 3 4 )u003d
1 2 1 2 1 2 x 3 1 0
0 2 x 2 1 2 2 1 2
2 0 2 1 2 n 1 formula
2 1 2 1 2 0
