A lot of people have trouble this.
This is not clearly explained in EBAE, but the example in the 2007 Update on pages L27 and L28 does shows the proper usage of a double emphasis indicator when a slash mark appears within the series of 4 or more words.
The double emphasis indicator is used.
Put out the dog/cat/rabbit.
..,put \ ! dog_/cat_/.ra2it4
I hope this helps
edited by SBorboa on 11/2/2011