Thank you both for taking the time to reply.
You wrote, " This is supposed to be an example of a bathroom group vented by a dry vent upstream of wet vent". Is this part of a homework assignment?
I'm afraid it's been over 30 year since I had a homework assignment. I am trying to understand (for my own edification) the approach of venting an entire bathroom group (or two) using a "horizontal wet vent" under the IPC. What I've gathered from here and other forums is that even though it is allowed it's a bad idea. Seems the only reason to do it is to save a little bit of time, a few fittings, and a few feet of pipe. So while the building and electrical codes have become more stringent the plumbing code has become more lax. Around here at least it's the land of pex, sharkbites, and AAVs.
For my own project I am venting the shower. I'm too far away from the lav riser but it's not a big deal to vent it individually.
Thanks guys!