15,4,107
#
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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070235
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0b0350
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130586
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1b07bc 1b07bc
1b07bc
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ffff7f ffff7f
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ffffff ffffff
ffffff
1f09d7 1f09d7
1f09d7