by steps
000000 000000
000000
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af2dfa
00007f 00007f
00007f
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0000ff
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b12bfa
007fff 007fff
007fff
00ff00 00ff00
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00ff7f
b42afa b42afa
b42afa
00ffff 00ffff
00ffff
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b728fa b728fa
b728fa
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ff7fff ff7fff
ff7fff
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c222fb
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
c521fc c521fc
c521fc