Section $3\mathrm{.}1$ Regular Expressions

$=\{a,b\}$

$($PRACTICE QUESTION$)$ Find all strings in $L((a+bb{)}^{**})$ of length five.

$($GRADED $2$ points$)$ Find all strings in $L((ab+b{)}^{**}b(a+ab{)}^{**})$ of length less than or less