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reference. Any scenario can be used as a subscenario, so a subscenario can potentially also be used as an independent scenario. When a subscenario inclusion is specied, the referenced subscenario does not have to be an already existing scenario: the user can dene the actual subscenario later, if desired. 6.9 Repetition specication A repetition specication can be specied to include one or more event lines | an event line may also be a subscenario. The repetition specication can be one of the following: +-character meaning one or more repetitions *-character meaning zero or more repetitions A numerical constant indicating the number of repetitions Free-form text describing the nature of the repetition specication A repetition specication can extend across several (consecutive) event lines, i.e. those lines form a looping construct and are repeated as a group. 20