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