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  1. or download this
    #!/usr/bin/perl
use strict;
...
my %hash = split / /, $str;

print Dumper \%hash;
  2. or download this
    Odd number of elements in hash assignment at test.pl line 7.
$VAR1 = {
...
          'odd_element' => undef,
          'two' => '2'
        };
  3. or download this
    #!/usr/bin/perl
use strict;
...
}

print Dumper \%hash;
  4. or download this
    $VAR1 = {
          'odd_element' => undef,
...
          'two' => '2',
          'three' => '3'
        };