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We say that two event instances “coincide” if they occur at the same parse location. We say the two event instances are coincident same-symbol-instance event instances iff both event instances trigger at the same parse location and both event instances are for the same symbol instance. Since every event triggered by a single symbol instance will be for the same symbol, coincident events triggered by a single symbol instance can differ only in their event type. This event type will always be one of the recognizer per-symbol events.