by steps
000000 000000
000000
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7f7f00
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00007f
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0000ff
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72810d 72810d
72810d
007fff 007fff
007fff
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00ff7f
66831b 66831b
66831b
00ffff 00ffff
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598529 598529
598529
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278d61 278d61
278d61
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ffffff ffffff
ffffff
1b8f6f 1b8f6f
1b8f6f