by steps
000000 000000
000000
6283de 6283de
6283de
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00007f
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0000ff
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00ff7f
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6c8be0
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00ffff
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728fe1 728fe1
728fe1
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ff7f7f
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ff7fff
87a0e5 87a0e5
87a0e5
ffff00 ffff00
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ffffff ffffff
ffffff
8da5e7 8da5e7
8da5e7