By {TAIL ~ a cationic Lewis acid} is meant a cation with {HEAD ~ a positive charge} such as Ag+, H+, and Na+ 
By { TAIL ~ a cationic Lewis acid } is meant a cation with { HEAD ~ a positive charge } such as Ag+ , H+ , and Na+
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH