by steps
000000 000000
000000
f921ef f921ef
f921ef
00007f 00007f
00007f
0000ff 0000ff
0000ff
007f00 007f00
007f00
007f7f 007f7f
007f7f
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f824ed
007fff 007fff
007fff
00ff00 00ff00
00ff00
00ff7f 00ff7f
00ff7f
f728eb f728eb
f728eb
00ffff 00ffff
00ffff
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7f007f
f62be9 f62be9
f62be9
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f62fe8
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f532e6
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f436e4
ff7f00 ff7f00
ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
f339e2 f339e2
f339e2
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
f33de1 f33de1
f33de1