by steps
000000 000000
000000
7f7f7f 7f7f7f
7f7f7f
00007f 00007f
00007f
0000ff 0000ff
0000ff
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007f7f
72828d 72828d
72828d
007fff 007fff
007fff
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00ff7f
66859b 66859b
66859b
00ffff 00ffff
00ffff
7f0000 7f0000
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5988a9 5988a9
5988a9
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408fc5 408fc5
408fc5
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3492d3 3492d3
3492d3
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ff7f7f
ff7fff ff7fff
ff7fff
2795e1 2795e1
2795e1
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
1b99ef 1b99ef
1b99ef