by steps
000000 000000
000000
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007fff
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e16228
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c44551
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b53765
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a72879 a72879
a72879
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ff7f7f
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ff7fff
981a8d 981a8d
981a8d
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ffff00
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ffff7f
ffffff ffffff
ffffff
8a0ca2 8a0ca2
8a0ca2