The routes 4 to 9 are provided in {HEAD ~ an overhead space} in {TAIL ~ a clean room} 
in
The routes 4 to 9 are provided in { HEAD ~ an overhead space } in { TAIL ~ a clean room }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL