by steps
000000 000000
000000
d72821 d72821
d72821
00007f 00007f
00007f
0000ff 0000ff
0000ff
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d62821
007fff 007fff
007fff
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00ff7f
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d52922
00ffff 00ffff
00ffff
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7f007f
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d52a22
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d42b23
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7fffff
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d32b24
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d32c24
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ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
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d22d25
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
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d22e26