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Implement shouldNotImplement:, a method
defined for the Object class. When sent to an instance of any
class, shouldNotImplement: is to use the error: message to
send an error message that opens an error window with the following title:
The the class should not implement the argument
Then, using shouldNotImplement, define < for the Food
class, such that any attempt to use < on a food or on an instance of
any of, say, the Vegetable subclasses of the Food class,
prints the following:
The Vegetable class should not implement <