Wirth–Weber_precedence_relationship
In computer science, a Wirth–Weber relationship between a pair of symbols is necessary to determine if a formal grammar is a simple precedence grammar. In such a case, the simple precedence parser can be used. The relationship is named after computer scientists Niklaus Wirth and Helmut Weber.
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The goal is to identify when the viable prefixes have the pivot and must be reduced. A means that the pivot is found, a means that a potential pivot is starting, and a means that a relationship remains in the same pivot.