Q$2.$ Construct DI:As for following languages, $=\{a,b\}$

$2\mathrm{.}5**2=5$ Marks

$-1-|w|w$ has exactly two a$\text{'}$s and at least tws b$\text{'}$s and $w$ has exactly one pair of consecutive zeros$\}$

$-1$l$.$ L$.\{$w $|$ w has an even number of a$\text{'}$s and each a is followed by at least one b$\}$

U$).$ Prove that the following languages are not regular.

$2\mathrm{.}5**2=5$ Marks