3.[13 marks] Let A- a, b, c). (i) Write out the set defined by the regular expression (b e | ba)(el a) ab (ii) Write down a regular expression over A whose elements are the set of all strings of odd length which begin with four bs. iii) Decide whether the following equation between regular expressions over A is true or false, justifying your answer a* ( a c a a l b a a ) = (a a* | ba)( cole)a*