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Next, you need to implement a method, updateMonth, which increments
the month whenever the value of the month instance variable is
different from the delivery month associated with the first element on the
event queue. Also, updateMonth adds a count of the rabbits to the
history ordered collection whenever the month changes:
RabbitApplication method definition • instance updateMonth [month < rabbits first deliveryMonth] whileTrue: [history addLast: rabbits size. month := month + 1]