Bridges or {HEAD ~ webs} are typically provided at {TAIL ~ different elevations} to define the cavities, which may be cored 
typically provided at
Bridges or { HEAD ~ webs } are typically provided at { TAIL ~ different elevations } to define the cavities , which may be cored
OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH