by steps
000000 000000
000000
92a728 92a728
92a728
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00007f
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0000ff
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91a62a
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007fff
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91a62d
00ffff 00ffff
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91a52f
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91a532
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90a434
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90a437
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ff7f7f
ff7fff ff7fff
ff7fff
90a339 90a339
90a339
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
90a33c 90a33c
90a33c