Modify the answering machine of Example 2.8 such that the owner can intervene at any time during the playing of pre-corded text or the recording of the message.

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Example 2.8 Figure 2.11 shows the state diagram of an answering machine. The machine is usually in the initial state on the left. Whenever a ring signal is received, clock x is reset to 0, and a transition into a waiting state is made. If the called person lifts off the handset, talking can take place until the handset is returned.