A method, apparatus and computer-implemented method, the method comprising: receiving a statechart comprising a complex feature; and replacing the complex feature with a transformed feature, thereby transforming the statechart to a second statechart, wherein replacing the complex feature comprises: creating an auxiliary variable or a default state; changing a value of the auxiliary variable at the beginning of the transformed feature and changing the value of the auxiliary variable again at its end; and taking a transition from the default state, such that the transition occurs in accordance with the value of the auxiliary variable.
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