by steps
000000 000000
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7fff7f
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83e67d
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88cd7b 88cd7b
88cd7b
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929b77 929b77
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978275 978275
978275
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ff7fff ff7fff
ff7fff
a15071 a15071
a15071
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ffff00
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ffff7f
ffffff ffffff
ffffff
a63870 a63870
a63870