=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
justified. Certain interior sequences are recognized both
here and in commands:
- I<text> italicize text, used for emphasis or variables
- B<text> embolden text, used for switches and programs
- S<text> text contains non-breaking spaces
- C<code> literal code
+ I<text> Italicize text, used for emphasis or variables
+ B<text> Embolden text, used for switches and programs
+ S<text> Text contains non-breaking spaces
+ C<code> Render code in a typewriter font, or give some other
+ indication that this represents program text
L<name> A link (cross reference) to name
L<name> manual page
L<name/ident> item in manual page