by steps
000000 000000
000000
38807a 38807a
38807a
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00007f
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0000ff
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007f7f 007f7f
007f7f
478078 478078
478078
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007fff
00ff00 00ff00
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00ff7f
578077 578077
578077
00ffff 00ffff
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7f0000 7f0000
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678076 678076
678076
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778175
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7fffff 7fffff
7fffff
878173 878173
878173
ff0000 ff0000
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978172 978172
978172
ff7f00 ff7f00
ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
a78171 a78171
a78171
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
b78270 b78270
b78270