13,2,223
#
in steps
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000000
0000ff 0000ff
0000ff
00007f 00007f
00007f
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007f00
007f7f 007f7f
007f7f
0300f7 0300f7
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00ff7f
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7f007f
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0d02df
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ff7fff ff7fff
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1604c7 1604c7
1604c7
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
1a05bf 1a05bf
1a05bf