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