by steps
000000 000000
000000
a25050 a25050
a25050
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00007f
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007fff
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997b3c
00ffff 00ffff
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90a728 90a728
90a728
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87d314
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ff7f7f
ff7fff ff7fff
ff7fff
83e90a 83e90a
83e90a
ffff00 ffff00
ffff00
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ffff7f
ffffff ffffff
ffffff