15,27,132
#
in steps
000000 000000
000000
1f3789 1f3789
1f3789
00007f 00007f
00007f
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0000ff
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007f00
007f7f 007f7f
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1b3087
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172986 172986
172986
00ffff 00ffff
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132285 132285
132285
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ff7fff
030680 030680
030680
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff