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Betweenness problem
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==Problem statement== The input to a betweenness problem is a collection of [[ordered triple]]s of items. The items listed in these triples should be placed into a [[total order]], with the property that for each of the given triples, the middle item in the triple appears in the output somewhere between the other two items. The items of each triple are not required to be consecutive in the output.<ref name="cs98"/><ref name="o79"/>
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