{HEAD ~ Acids} such as sulfuric, hydrochloric, hydrobromic, phosphoric, trifluoroacetic and {TAIL ~ trifluorosulfonic} are acceptable 
such as
{ HEAD ~ Acids } such as sulfuric , hydrochloric , hydrobromic , phosphoric , trifluoroacetic and { TAIL ~ trifluorosulfonic } are acceptable
HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH