Prove the following languages are regular using the Myhill$-$Nerode theorem. Let $\backslash$Sigma $=\{$a$,$ b$\}$ : $-\{$w $|$ w$.$ is any string not in $.$a$^*$ b$^*\}-\{,$ a$\}-\{$w $|$ every odd position of w is a b$\}$