by steps
000000 000000
000000
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007fff
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00007f
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1381df 1381df
1381df
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00ff7f
2684c0 2684c0
2684c0
00ffff 00ffff
00ffff
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3987a0 3987a0
3987a0
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4c8a81
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5f8c62
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728f42 728f42
728f42
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ff7f7f
ff7fff ff7fff
ff7fff
859223 859223
859223
ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff
989504 989504
989504