ANSWER:

Sent in by James of Germantown, MD, you will need a copy of Mastering Elliott Wave to get the full gist of this question. 

The answer is YES, but you want to make sure wave-x is not retraced more than 61.8% of the first a-b-c pattern. X-waves should never retrace more than 61.8% of any zigzag. If they do, something other than an x-wave is unfolding.