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use strict;
use warnings;
...
3
Argument "" isn't numeric in addition (+) at 2perl.pl line 10.
4

use strict;
use warnings;
...
3
Argument "" isn't numeric in int at 2perl.pl line 9.
4

use strict;
use warnings;
...
--output:--
Name "main::b" used only once: possible typo at 2perl.pl line 12.
Name "main::a" used only once: possible typo at 2perl.pl line 12.