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Patterns, or generic expressions which can be matched a variety specific expressions, are central to symbolic computation, programming, and list processing in Mathematica. Some patterns are straightforward to define in Mathematica, but others which should be are not. The PatternOperations package provides functions which simplify the construction of more complicated patterns. These functions allow patterns to be modified or combined through "logic" operations analogous to the ordinary logic functions Not, And, Or, etc.
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