21,39,43
#
in steps
000000 000000
000000
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00007f
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0000ff
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007f00
007f7f 007f7f
007f7f
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0a1315
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1a3136
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25454c 25454c
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ffff7f ffff7f
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ffffff ffffff
ffffff
2b4f57 2b4f57
2b4f57