by steps
000000 000000
000000
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7f7f7f
00007f 00007f
00007f
0000ff 0000ff
0000ff
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007f00
007f7f 007f7f
007f7f
87847e 87847e
87847e
007fff 007fff
007fff
00ff00 00ff00
00ff00
00ff7f 00ff7f
00ff7f
8f897d 8f897d
8f897d
00ffff 00ffff
00ffff
7f0000 7f0000
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7f007f 7f007f
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988e7c 988e7c
988e7c
7f00ff 7f00ff
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7f7f00 7f7f00
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a0947b a0947b
a0947b
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7f7fff
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7fff7f 7fff7f
7fff7f
7fffff 7fffff
7fffff
a8997a a8997a
a8997a
ff0000 ff0000
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b19e79
ff7f00 ff7f00
ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
b9a378 b9a378
b9a378
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
c2a978 c2a978
c2a978