Discover ambiguities or omissions in the following statement of requirements for part ofa ticket-issuing system:An automated ticket-issuing system sells rail tickets. Users select their destination andinput a credit card and a personal identification number. The rail ticket is issued and theircredit card account charged. When the user presses the start button, a menu display ofpotential destinations is activated, along with a message to the user to select a destination.Once a destination has been selected, users are requested to input their credit card. Itsvalidity is checked and the user is then requested to input a personal identifier. When thecredit transaction has been validated, the ticket is issued.
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