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