by steps
000000 000000
000000
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818245
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00007f
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7e8241
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00ff7f
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7c823e
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7a823b
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7f7f7f
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768234 768234
768234
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748231
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ff7fff
72822e 72822e
72822e
ffff00 ffff00
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ffffff ffffff
ffffff
70832b 70832b
70832b