by steps
000000 000000
000000
728c18 728c18
728c18
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00007f
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0000ff
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738a15
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007fff
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00ff7f
758812 758812
758812
00ffff 00ffff
00ffff
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76870f 76870f
76870f
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7a8309
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7b8206
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ff7f7f
ff7fff ff7fff
ff7fff
7d8003 7d8003
7d8003
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff