One or more metal tubes passes through the holes of the plates to position the plates with {HEAD ~ their second portions} forming {TAIL ~ a substantially continuous sheet} 
forming
One or more metal tubes passes through the holes of the plates to position the plates with { HEAD ~ their second portions } forming { TAIL ~ a substantially continuous sheet }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL