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be used as an error-correcting code. A block code can also be described as a family of sets, by describing each codeword as the set of positions at which it contains a 1.
* A topological space consists of a pair where is a set (whose elements are called points) and is a [[Topology (structure) on , which is a family of sets (whose elements are called open sets) over that contains both the empty set and itself,

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