by steps
000000 000000
000000
7f7f7f 7f7f7f
7f7f7f
00007f 00007f
00007f
0000ff 0000ff
0000ff
007f00 007f00
007f00
007f7f 007f7f
007f7f
72877e 72877e
72877e
007fff 007fff
007fff
00ff00 00ff00
00ff00
00ff7f 00ff7f
00ff7f
658f7e 658f7e
658f7e
00ffff 00ffff
00ffff
7f0000 7f0000
7f0000
7f007f 7f007f
7f007f
58977e 58977e
58977e
7f00ff 7f00ff
7f00ff
7f7f00 7f7f00
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4ba07e 4ba07e
4ba07e
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7f7fff
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7fff7f 7fff7f
7fff7f
7fffff 7fffff
7fffff
3ea87d 3ea87d
3ea87d
ff0000 ff0000
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31b07d 31b07d
31b07d
ff7f00 ff7f00
ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
24b87d 24b87d
24b87d
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
18c17d 18c17d
18c17d