by steps
000000 000000
000000
619872 619872
619872
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00007f
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0000ff
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728781 728781
728781
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007fff
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00ff7f
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837690
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00ffff
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9466a0 9466a0
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ff7fff
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ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff
eb13ed eb13ed
eb13ed