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In addition to public derivations, there are protected derivations
and private derivations, expressed by protected and
private, which you learn about later, in the hardcopy version of this book.
Protected and private derivations can combine with variable declarations
and function definitions in public and private parts of class definitions
as well as with another part, introduced in the hardcopy version of this book, called
the protected part. Exploiting all these potential
derivation-type–class-part combinations adds a dimension of
complexity to C++ programming.