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use warnings;

use strict;

use warnings;
use strict;

my $x;
print "$x\n";

Use of uninitialized value $x in concatenation (.) or string at script
+.pl line 4.

use warnings;
use strict;

print "$y\n";

Global symbol "$y" requires explicit package name (did you forget to d
+eclare "my $y"?) at script.pl line 4.