15,55,63
#
in steps
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000000
1f3343 1f3343
1f3343
00007f 00007f
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0000ff
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007f00
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1b3442
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173541
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033a3c 033a3c
033a3c
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ffff7f ffff7f
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ffffff ffffff
ffffff
003b3b 003b3b
003b3b