{HEAD ~ The mixture} comprises {TAIL ~ a precursor} of a desired material within a supercritical fluid, and is initially provided in the chamber under first conditions at which the precursor is stable 
comprises
{ HEAD ~ The mixture } comprises { TAIL ~ a precursor } of a desired material within a supercritical fluid , and is initially provided in the chamber under first conditions at which the precursor is stable
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH