A building insulation 1 in which said {HEAD ~ cellulose fiber} is {TAIL ~ a long fiber cellulose} 
is
A building insulation 1 in which said { HEAD ~ cellulose fiber } is { TAIL ~ a long fiber cellulose }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL