-<P>You will notice in the above example that the second line has brackets. Look
-at the line logically. You can see there are 2 separate sections to it. We
-are saying reject spots that are VHF or above <EM>APART</EM> from those in
-zones 14, 15 and 16 (either spotted there or originated there). If you did
-not have the brackets to separate the 2 sections, then Spider would read it
-logically from the front and see a different expression entirely ...
-<P>
-<BLOCKQUOTE><CODE>
-<PRE>
-(on 50000/1400000 and by_zone 14,15,16) or call_zone 14,15,16
-</PRE>
-</CODE></BLOCKQUOTE>
-<P>The simple way to remember this is, if you use OR - use brackets. Whilst we are
-here CASE is not important. 'And BY_Zone' is just the same as 'and by_zone'.
-<P>As mentioned earlier, setting several filters can be more flexible than
-simply setting one complex one. Doing it in this way means that if you want
-to alter your filter you can just redefine or remove one or more lines of it or
-one line. For example ...
-<P>
-<BLOCKQUOTE><CODE>
-<PRE>
-reject/spots 1 on hf/ssb
-</PRE>
-</CODE></BLOCKQUOTE>
-<P>would redefine our earlier example, or
-<P>
-<BLOCKQUOTE><CODE>
-<PRE>
-clear/spots 1
-</PRE>
-</CODE></BLOCKQUOTE>
-<P>To remove all the filter lines in the spot filter ...
-<P>
-<BLOCKQUOTE><CODE>
-<PRE>
-clear/spots all
-</PRE>
-</CODE></BLOCKQUOTE>
-<P>
-<H2><A NAME="ss7.3">7.3 Filter options</A>
-</H2>
-
-<P>You can filter in several different ways. The options are listed in the
-various helpfiles for accept, reject and filter.
-<P>
-<H2><A NAME="ss7.4">7.4 Default filters</A>