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Well as far as I have analyzed, q2a looks for only question number.

Even using http://www.question2answer.org/qa/61130 will do the job.

So, q2a will load question #61130. Rest of the URL is just for the search engine.

Hope that helps!
Indeed, the following url still gives the same page:

Joomla used to work like this, then they changed the routing system: