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To capture the event-queue simulation recipe, you define step, a
RabbitApplication instance method.
Because the Rabbit instance that has the earliest delivery month is
always at the front of the rabbits collection, step can obtain
that Rabbit instance by sending the removeFirst message,
which both removes the Rabbit instance from the collection and makes
the Rabbit instance available for assignment to the mother
instance variable:
RabbitApplication method definition • instance step | mother daughter | mother := rabbits removeFirst. ...