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  1. or download this
    use strict;
use warnings;
...
my $h = 1;

print "$a$b$c$d$e$f$g$h\n";
  2. or download this
        
Use of uninitialized value in concatenation (.) or string at x.pl line
+ 14.
1111111
  3. or download this
        
Use of uninitialized value $d in concatenation (.) or string at x.pl l
+ine 14.
1111111