12,5,179
#
in steps
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000000
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00007f
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0000ff
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007f00
007f7f 007f7f
007f7f
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00ff7f
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0904a6
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0c05b3
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1509da 1509da
1509da
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ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
180be7 180be7
180be7