This program illustrates how the equal_range() member function can be used
to find a range of equal key values in a multimap.
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Here are the names in our multimap. Note that  the lastname is the key, and
the first name is the corresponding value:
Doe, Harvey
Doe, Wilma
Doe, Rachel
Johnson, J.T.
Jones, Fred
Jones, Alice
Smith, Tom
Smith, Alicia
Smith, Jon
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Enter a last name to see all the folks with that last name: Jones
Jones, Fred
Jones, Alice
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