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Old 06-17-2010, 03:49 AM   #34
pdurrant
The Grand Mouse 高貴的老鼠
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Quote:
Originally Posted by dreams View Post
OK I give up. I started 3 different solutions and got lost in the reasoning in all 3 of them.
It is difficult to work out what happens in the case presented without considering simpler cases first. I refer you to my (small) clue here: https://www.mobileread.com/forums/sho...9&postcount=13
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