{HEAD ~ The set} includes an elongated flexible separation chamber which is formed with {TAIL ~ at least one interface region} thereon 
{ HEAD ~ The set } includes an elongated flexible separation chamber which is formed with { TAIL ~ at least one interface region } thereon
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH