{HEAD ~ Thus, any occurrence} of a combination of sequences that causes {TAIL ~ large interference} may reduce the communications quality 
causes
{ HEAD ~ Thus , any occurrence } of a combination of sequences that causes { TAIL ~ large interference } may reduce the communications quality
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH