67,2,126
#
in steps
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000000
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00007f
0000ff 0000ff
0000ff
007f00 007f00
007f00
007f7f 007f7f
007f7f
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00ff7f
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21017e
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32017e 32017e
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54027d 54027d
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76037d 76037d
76037d
ffff00 ffff00
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ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
87047d 87047d
87047d