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use warnings;
...
print Dumper \%hash;

$VAR1 = {
          'alias' => {
                       '' => 'four five six'
                     }
        };

Use of uninitialized value in anonymous hash ({}) at wsfp-scratchpad2.
+pl line 11.
Use of uninitialized value in anonymous hash ({}) at wsfp-scratchpad2.
+pl line 11.
Use of uninitialized value in anonymous hash ({}) at wsfp-scratchpad2.
+pl line 11.

$VAR1 = {
          'alias' => {
...
                     }
        };