by steps
000000 000000
000000
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dbe778
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00007f
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0000ff
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00ff7f 00ff7f
00ff7f
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dce878
00ffff 00ffff
00ffff
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7f7f7f
dde978 dde978
dde978
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dee978 dee978
dee978
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dfea78 dfea78
dfea78
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ffffff ffffff
ffffff
e0eb79 e0eb79
e0eb79