15,21,121
#
in steps
000000 000000
000000
121978 121978
121978
00007f 00007f
00007f
0000ff 0000ff
0000ff
007f00 007f00
007f00
007f7f 007f7f
007f7f
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111878
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00ff7f
101778 101778
101778
00ffff 00ffff
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7f007f 7f007f
7f007f
101678 101678
101678
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7f00ff
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7f7f00
7f7f7f 7f7f7f
7f7f7f
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0f1579
7f7fff 7f7fff
7f7fff
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7fff7f 7fff7f
7fff7f
7fffff 7fffff
7fffff
0e1479 0e1479
0e1479
ff0000 ff0000
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0e1379
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ff7f7f ff7f7f
ff7f7f
ff7fff ff7fff
ff7fff
0d1279 0d1279
0d1279
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
0d127a 0d127a
0d127a