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  1. or download this
    package example;
use v5.10;
...
   use example;

   say "debug=$debug";
  2. or download this
    
[255]  # perl test_our_behaviour.pl
...
Use of uninitialized value $example::debug in concatenation (.) or str
+ing at example.pm line 14.
IN EXAMPLE: debug=
debug=1