Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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SeT

A SeT is a collection of objects. For example, one can define the set '''S''' = {Sn: Sn is a sibling of Larry Sanger}.

We require that sets be well-defined. Given an object Sn, we must be able to determine if 
Sn belongs to '''S'''.