{TAIL ~ The mixture} includes {HEAD ~ a precursor} of a desired material within a supercritical fluid 
{ TAIL ~ The mixture } includes { HEAD ~ a precursor } of a desired material within a supercritical fluid
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH