by steps
000000 000000
000000
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00007f
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0000ff
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83ea11
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007fff
00ff00 00ff00
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00ff7f
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87d522
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7f007f
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8fab44
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7fffff
939655 939655
939655
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978166 978166
978166
ff7f00 ff7f00
ff7f00
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ff7f7f
ff7fff ff7fff
ff7fff
9b6c77 9b6c77
9b6c77
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
a05888 a05888
a05888