15,25,225
#
in steps
000000 000000
000000
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0000ff
00007f 00007f
00007f
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007f00
007f7f 007f7f
007f7f
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1b2ccb 1b2ccb
1b2ccb
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ffffff ffffff
ffffff
1f33c4 1f33c4
1f33c4