{HEAD ~ The device} 1 further comprising {TAIL ~ a pair} of end caps adapted for sealing opposing ends of said device 
comprising
{ HEAD ~ The device } 1 further comprising { TAIL ~ a pair } of end caps adapted for sealing opposing ends of said device
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH