by steps
000000 000000
000000
5e7eff 5e7eff
5e7eff
00007f 00007f
00007f
0000ff 0000ff
0000ff
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007f7f 007f7f
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728eff 728eff
728eff
007fff 007fff
007fff
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00ff7f
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869eff
00ffff 00ffff
00ffff
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ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
eaeeff eaeeff
eaeeff
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff