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print
  $q->checkbox_group
...
    -values=>\@predefined,
    -defaults=>param('predefined'),
  );

<input type="checkbox" name="predefined" value="ARRAY(0x833ced0)" />AR
+RAY(0x833ced0)<br />

print
  $q->checkbox_group
...
    -values=>@predefined,
    -defaults=>param('predefined'),
  );

<input type="checkbox" name="predefined" value="element content" />ele
+ment content<br />

print $query->checkbox_group(-name=>'group_name',
                                       -values=>['eenie','meenie','min
+ie','moe'],
                                       -default=>['eenie','moe'],
                                       -linebreak=>'true',
                                       -labels=>\%labels);

@h = $query->checkbox_group(-name=>'group_name',-values=>\@values);
&use_in_creative_way(@h);

print $h[0];
---
<input type="checkbox" name="group_name" value="ARRAY(0x833d000)" />AR
+RAY(0x833d000)