12,20,191
#
in steps
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000000
0000ff 0000ff
0000ff
00007f 00007f
00007f
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007f00
007f7f 007f7f
007f7f
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7f7fff 7f7fff
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15238f 15238f
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ffff00 ffff00
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ffff7f ffff7f
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ffffff ffffff
ffffff
19287f 19287f
19287f