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What Are Combination States?
When a Stateflow diagram has states with parallel (AND) decomposition, multiple states can be active simultaneously. A combination state is a notational representation of those multiple states. For example, a Stateflow diagram could have two active states with parallel (AND) decomposition,A.B and X.Y. Using combination state notation, the activity of the Stateflow diagram is denoted by (A.B,X.Y).
A state is characterized by its label. The label consists of the name of the state optionally followed by a / character and additional keywords defined below. The label appears on the top left-hand corner of the state rectangle.