by steps
000000 000000
000000
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7f7f7f
00007f 00007f
00007f
0000ff 0000ff
0000ff
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728b77 728b77
728b77
007fff 007fff
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66976f 66976f
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00ffff 00ffff
00ffff
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59a367 59a367
59a367
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40bb57 40bb57
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34c74f 34c74f
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ff7f7f
ff7fff ff7fff
ff7fff
27d347 27d347
27d347
ffff00 ffff00
ffff00
ffff7f ffff7f
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ffffff ffffff
ffffff
1be040 1be040
1be040