Consider the following Latin square on the alphabet A $=\{$a$,$b$,$c$,$d$\}.$bcad cdba dacb abdcLet be the binary operation on A obtained from the above Latin square. $($We have indexed the rows, from top to bottom, and columns, from left to right, by a$,$b$,$c$,$ and d$.)$ Find ab$,($ad$)$c$,$ and ac$.$