13,15,191
#
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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00ff7f
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0d0fbf
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1013af 1013af
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161b8f 161b8f
161b8f
ffff00 ffff00
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ffff7f ffff7f
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ffffff ffffff
ffffff
1a1f80 1a1f80
1a1f80