15,6,120
#
in steps
000000 000000
000000
000777 000777
000777
00007f 00007f
00007f
0000ff 0000ff
0000ff
007f00 007f00
007f00
007f7f 007f7f
007f7f
030677 030677
030677
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007fff
00ff00 00ff00
00ff00
00ff7f 00ff7f
00ff7f
070677 070677
070677
00ffff 00ffff
00ffff
7f0000 7f0000
7f0000
7f007f 7f007f
7f007f
0b0677 0b0677
0b0677
7f00ff 7f00ff
7f00ff
7f7f00 7f7f00
7f7f00
7f7f7f 7f7f7f
7f7f7f
0f0678 0f0678
0f0678
7f7fff 7f7fff
7f7fff
7fff00 7fff00
7fff00
7fff7f 7fff7f
7fff7f
7fffff 7fffff
7fffff
130578 130578
130578
ff0000 ff0000
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ff007f
ff00ff ff00ff
ff00ff
170578 170578
170578
ff7f00 ff7f00
ff7f00
ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
1b0578 1b0578
1b0578
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
1f0579 1f0579
1f0579