{HEAD ~ Thickening} can occur through {TAIL ~ a variety} of physical and chemical mechanisms including curing and drying  
occur through
{ HEAD ~ Thickening } can occur through { TAIL ~ a variety } of physical and chemical mechanisms including curing and drying
HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH