I wrote a thing about how filter expressions can be represented as logic 
statements that may help you but I don't have the link on this computer. 
The quick answer is that you can use this:

<$list filter='[tag[TableOfContents]]'>
<$list filter='[is[current]tags[]]-[[TableOfContents]]' 
emptyMessage="""<<currentTiddler>>""">
<span/>
</$list>
</$list>

to test it put it in a tiddler on tiddlywiki.com and look at the list, then 
add another tag to HelloThere and it will be removed from the list. You can 
change the emptyMessage to whatever you want to display for each tiddler. 
If you want more than one tag to be tested for you just make the first 
filter something like [tag[a]tag[b]] and add -[[a]]-[[b]] to the second 
filter.

There is almost certainly an easier way to do whatever it is you are trying 
to do.

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