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If we are trying to add a module or library files in our
program using require or use statement then it will search
that module or library files in the Perl's default search path.
The statement use lib is used to add the directories to
default search path.
So if the module or library file is not located in the
Perl's default search path then it will find the library
files in the path we have given with the use lib $path.
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