{HEAD ~ A substrate} is provided within {TAIL ~ a reaction chamber}, and a mixture is also provided within the chamber 
is provided within
{ HEAD ~ A substrate } is provided within { TAIL ~ a reaction chamber } , and a mixture is also provided within the chamber
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH