Hi Tony. Thanks for your response. Would you be able to go into a little 
more detail? I had a look at the subfilter operator and fiddled with it for 
a bit but I'm not sure that I really understand it!

Not an answer but a possible approach. Have a look at using the subfilter 
> operator. A subfilter that lists the set of tiddlers, another that lists 
> the items to exclude.
>

Hi Bimlas. Thanks for your response. I'm not sure that the listed[] filter 
would work for this case. It lists tiddlers that list the input tiddlers, 
whereas I would want to list tiddlers that *are listed by* the input 
tiddlers.

I'm not sure I understand how you want to use it, but the `-[listed[]]`" 
> filter can filter out the tiddlers listed in the `list` (or any other) 
> field of other tiddlers.
>

I will give an example to make it clear what I am trying to do.

Tiddler A lists Tiddler B. Tiddler B lists Tiddler C. I want a filter that 
returns Tiddler A, since it is not listed by any of the other tiddlers. In 
this case listed[] returns A and B.

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