by steps
000000 000000
000000
dcc728 dcc728
dcc728
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0000ff
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d0ce32
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c4d53d
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b9dc48
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a1ea5e a1ea5e
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ff7f7f
ff7fff ff7fff
ff7fff
8af874 8af874
8af874
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff