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  1. or download this
    package Utils;
    
    ...
    
    1;
    
  2. or download this
    #This file: app.pl
    use strict;
    ...
    use Utils1;
    
    Log("App started");
    
  3. or download this
    $ perl app.pl
    Undefined subroutine &main::Log called at app.pl line 8.
    $