This loads the package.
The next class defines a protected class member.
This member may not be used by something outside the class hierarchy (which consists here only of base and Object). A child class may use the method.
Please observe that you may not define a child's member less visible than an already defined member in a parent class. Override is a marker to underline the change in functionality of a parent class. The same or a broader accessibility is allowed.
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EXAMPLES
Basic Examples 
