=head1 heading
=head2 heading
+ =head3 heading
+ =head4 heading
=item text
=over N
=back
=item =head2
-Head1 and head2 produce first and second level headings, with the text in
-the same paragraph as the "=headn" directive forming the heading description.
+=item =head3
+
+=item =head4
+
+Head1, head2, head3 and head4 produce first, second, third and fourth
+level headings, with the text in the same paragraph as the "=headn"
+directive forming the heading description.
=item =over