Recall that for a string x$,$ x

R $($the reverse of x$)$ is the string obtained by writing x from

right to left. For example, $($aabbb$)$

R $=$ bbbaa. For a language A$,$ AR $=\{$x

R $|$ x in A$\}.$

$($a$)$ Suppose A $=\{,$ b$,$ aabb, babababb$\}.$ What is AR$?$