{HEAD ~ Solvents} such as {TAIL ~ fluorosulfonic acid} may also serve to generate the dopant 
{ HEAD ~ Solvents } such as { TAIL ~ fluorosulfonic acid } may also serve to generate the dopant
HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH