7,10,243
#
in steps
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000000
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0000ff
00007f 00007f
00007f
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007f00
007f7f 007f7f
007f7f
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0d12ea 0d12ea
0d12ea
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ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
0f15e8 0f15e8
0f15e8