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undef (value)
    autovivification and 
    filesystem capture example 
    ref operator and 
    variables with value of 
    weak references and 
unimport method (Exporter) 
UNIVERSAL class
    inheritance and 
    purpose of 
    utility methods  2nd 
unshift function  2nd 
URI::URL module 
URIs (universal resource identifiers) 
url subroutine (URI::URL) 
use base 
use CGI 
use lib  2nd  3rd 
use operation  2nd  3rd  4th 
use strict  2nd 

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