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  1. or download this
    use strict;

...
&f("a");
&f("b");
&f("c");
  2. or download this
    $ perl -w a.pl
Variable "$a" is not available at (eval 1) line 2.
...
Variable "$c" is not available at (eval 3) line 2.
Use of uninitialized value in print at a.pl line 11.
c=