In case there are {HEAD ~ different security classes} among {TAIL ~ end user devices} of the same group, the L2 network access tier devices may sub divide the group or more assign the lowest security class to the group to which the most vulnerable end user device conforms 
among
In case there are { HEAD ~ different security classes } among { TAIL ~ end user devices } of the same group , the L2 network access tier devices may sub divide the group or more assign the lowest security class to the group to which the most vulnerable end user device conforms
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH