6,21,121
#
in steps
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000000
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00007f
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0000ff
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007f00
007f7f 007f7f
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030a7c
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0a2574 0a2574
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ffff00 ffff00
ffff00
ffff7f ffff7f
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ffffff ffffff
ffffff
0c2b73 0c2b73
0c2b73