Importing

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use Module;

Every function (and variable) listed in the @EXPORT array is imported
automatically.

use Module ();

Nothing is imported.

use Module qw(foo bar);

Functions foo() and bar() are imported, nothing else. Any function from the @EXPORT and @EXPORT_OK arrays can be requested to be imported. There is also an %EXPORT_TAGS that can be used to define groups of functions to be imported.