0,56,120
#
in steps
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000000
007171 007171
007171
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00007f
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007f00 007f00
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007f7f 007f7f
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ff7fff ff7fff
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000e7d 000e7d
000e7d
ffff00 ffff00
ffff00
ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff