18,26,216
#
in steps
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000000
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1923cb
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00007f
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0000ff
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007f00
007f7f 007f7f
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1720ce
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151ed1
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0d13e1 0d13e1
0d13e1
ffff00 ffff00
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ffffff ffffff
ffffff
0c11e5 0c11e5
0c11e5