by steps
000000 000000
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0000ff
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f47b09
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e97813 e97813
e97813
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bd6a39
ff7f7f ff7f7f
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ff7fff ff7fff
ff7fff
b26742 b26742
b26742
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
a8644c a8644c
a8644c