I wouldn't waste time on this.

Although EMD's have partly influenced SERP again since last update (very slightly) - a 5 word EMD aint going to stay on page one ever.

I used to have a dozen or so Adsense related sites that were EMDs with less words and they have almost all dropped off the face of the earth.

In terms of %influence on EMD's here is a snapshot so you can see how irrelevant they are (less than 2% contribution to rankings)

Screen Shot 2013-09-14 at 9.21.08 AM.png

View the original article here