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Usenet Newsgroups : rec.puzzles Hall of Fame


The rec.puzzles Hall of Fame is a compilation of over 500 of the most popular puzzles that have been posted and discussed in the rec.puzzles newsgroup. In most cases a detailed solution has been provided.

Many of these puzzles also appear in Braingle's own collection.

   
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Categories : combinatorics : full.p

Consider a string that contains all substrings of length n.  For
example, for binary strings with n=2, a shortest string is 00110 -- it
contains 00, 01, 10 and 11 as substrings.  Find the shortest such
strings for all n.


Solution


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