by steps
000000 000000
000000
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00007f
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0000ff
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007fff
00ff00 00ff00
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d537e0
00ffff 00ffff
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c053d1
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ac6fc2 ac6fc2
ac6fc2
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7fff7f 7fff7f
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7fffff
978ab2 978ab2
978ab2
ff0000 ff0000
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82a6a3 82a6a3
82a6a3
ff7f00 ff7f00
ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
6dc294 6dc294
6dc294
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
59de85 59de85
59de85