135,137,143
#
in steps
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000000
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7f7f7f
00007f 00007f
00007f
0000ff 0000ff
0000ff
007f00 007f00
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818183
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838487 838487
838487
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00ffff
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ffff00 ffff00
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ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
90949f 90949f
90949f