{HEAD ~ The synthetic fibers} thus function as {TAIL ~ a reinforcing web} or backbone to maintain some mechanical integrity and strength of the paper 
{ HEAD ~ The synthetic fibers } thus function as { TAIL ~ a reinforcing web } or backbone to maintain some mechanical integrity and strength of the paper
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH