Creates a new POP state (type - 2) with the same transitions.
        The POPed symbol is the unique number of the state.
        Args:
            trans (dict): Transition dictionary
        Returns:
            Int: The state identifier

def _generate_state(self, trans):
        """
        Creates a new POP state (type - 2) with the same transitions.
        The POPed symbol is the unique number of the state.
        Args:
            trans (dict): Transition dictionary
        Returns:
            Int: The state identifier
        """
        state = PDAState()
        state.id = self.nextstate()
        state.type = 2
        state.sym = state.id
        state.trans = trans.copy()
        self.toadd.append(state)
        return state.id