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Reference.org
Necklace problem
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<p>The necklace problem is a problem in <a href="/facts/Recreational_mathematics/p2b8zl2J">recreational mathematics</a> concerning the reconstruction of <a href="/facts/Necklace_(combinatorics)/Qg4AY4Mz">necklaces</a> (cyclic arrangements of binary values) from partial information. </p>