$field_aref = \[                            # fields
                  'title1',
                  'title2',
                  'pages',
                  'author'
                ];
  at data.plx line 28.
$value_aref = \[                            # first when sorted by author
                  'Perl Best Practices',
                  'hound dog',
                  'a few',
                  'Damian Conway'
                ];
  at data.plx line 30.
$value_aref = \[
                  'Programming Perl',
                  'camel',
                  'many',
                  'Larry Wall'
                ];
  at data.plx line 30.
$value_aref = \[
                  'Learning Perl',
                  'llama',
                  'thin',
                  'Randal Schwartz'
                ];
  at data.plx line 30.