3) (15pts) List at least 3 words in the language and write regular expressions for the following: a. ={a,b}L={ all words that have are three letters long and only have one letter b in them b. ={a,b}L= \{all words that can be of any length and only have one letter b in them c. ={a,b,c}L={ all words that begin with the letter a} d. ={a,b,c}L={ all words that either begin with the letter a or the letter b } e. ={a,b,c}L={ all words that begin and end with the same letter }