How to select among three tiddlers in below priority?

- if tid1, tid2, and tid3 are existed then return tid1
-if tid2, and tid3 are existed return tid2
-if tid1 and tid2 are NOT existed then return tid3

Note the first two tiddlers come from a filter result and we don not know 
their name in advance like 

   - [tag[a]] for tid1
   - [tag[b]] for tid2

I thought the below code may work, what do you propose?

<$list filter="[tag[a]] [tag[b]] +[limit[1]]" emptyMessage="tid3">
<<currentTiddler>>
</$list>


--Mohammad

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