1. Determine a possible regular expression that could define a language containing strings ab, acb, accb, adb, addb, adddb, ...

2. Write five strings to describe the language defined by the regular expression (a|b)(c|d)*a.

Determine a possible regular expression that could define a language containing strings ab, acb, accb, adb, addb, adddb, .. a. b. Write five strings to describe the language defined by the regular expression (alb)(c|d)*a