21,4,124
#
in steps
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000000
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00007f
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0000ff
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007f00
007f7f 007f7f
007f7f
05017e 05017e
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00ff7f 00ff7f
00ff7f
0a027d 0a027d
0a027d
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0f037d
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1a057b 1a057b
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24077a 24077a
24077a
ffff00 ffff00
ffff00
ffff7f ffff7f
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ffffff ffffff
ffffff
2a087a 2a087a
2a087a