Though rare, in rock and popular music, the third of the dominant eleventh ("as theoretically conceived": C, E, G, B♭, D, F) for example, is usually omitted. It may be notated in charts as, C11, or, more often, "descriptively," as Gm7/C. The fifth is also sometimes omitted, thus turning the chord into a suspended chord.
A: Glad you are enjoying my book.
Here is an example of a voicing with both the 3rd and 4th that seems to work for me but then again, I don't play all the notes at the same time. I more or less play the notes separately like a pianist would so I think a voicing like this works better for a ballad. It is spelled 1-b7-3-4-1 and if you absolutely have to play the root, you can do so with your thumb.