by steps
000000 000000
000000
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007fff
00007f 00007f
00007f
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1381f3
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00ff7f
2684e7 2684e7
2684e7
00ffff 00ffff
00ffff
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3986db 3986db
3986db
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5f8cc3 5f8cc3
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728eb7 728eb7
728eb7
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ff7f7f
ff7fff ff7fff
ff7fff
8591ab 8591ab
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ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff
99949f 99949f
99949f