{HEAD ~ Suitable means} include, but are not limited to, the periodic addition of base to the aqueous solution or {TAIL ~ the use} of buffers 
include
{ HEAD ~ Suitable means } include , but are not limited to , the periodic addition of base to the aqueous solution or { TAIL ~ the use } of buffers
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH