by steps
000000 000000
000000
00ffff 00ffff
00ffff
00007f 00007f
00007f
0000ff 0000ff
0000ff
007f00 007f00
007f00
007f7f 007f7f
007f7f
12eff3 12eff3
12eff3
007fff 007fff
007fff
00ff00 00ff00
00ff00
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00ff7f
25dfe7 25dfe7
25dfe7
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7f007f
38d0db 38d0db
38d0db
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7f7f7f
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4bc0cf
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7fff7f
7fffff 7fffff
7fffff
5eb0c3 5eb0c3
5eb0c3
ff0000 ff0000
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71a1b7 71a1b7
71a1b7
ff7f00 ff7f00
ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
8491ab 8491ab
8491ab
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
9782a0 9782a0
9782a0