Construct a ?nite-state machine for entering a security codeinto an automatic teller machine (ATM) that implements these rules:A user enters a string of four digits, one digit at a time. If theuser enters the correct four digits of the password, the ATMdisplays a welcome screen. When the user enters an incorrect stringoff our digits,the ATM displays a screen that informs the user thatan incorrect password was entered. If a user enters the incorrectpassword three times, the account is locked.
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