Discover ambiguities or omissions in the following statement of requirements for part of a coffee dispensing system: An automated coffee dispensing vending machine dispenses three types of coffee drinks, Espresso, Coffee Latte, and Americano, as hot or cold drinks in four different quantities. A User can select the coffee type and need to input a credit card and a personal identification number for payment. Once the user has selected a drink size, it can only change the size to the larger one. The user can opt for additional ice for the cold drinks at some added cost. The machine will display the price of the drink. Once the user has made his final selection, the amount will be deducted from his account, and the coffee will be dispensed