3.4 Modifiers
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@secref["intermedAcc:mods" #:doc '(lib "profj/scribblings/htdc.scrbl")]
The modifiers public, private, and protected
controll access to the
modified member. A public member can be accessed by any class. A private member can only be accessed
by the containing class. A protected member can be accessed by the containing class and subclasses.