15,9,187
#
in steps
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000000
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0000ff
00007f 00007f
00007f
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007f00
007f7f 007f7f
007f7f
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0b07cc
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130baa 130baa
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ff7fff ff7fff
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1b1088 1b1088
1b1088
ffff00 ffff00
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ffff7f ffff7f
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ffffff ffffff
ffffff
1f1377 1f1377
1f1377