I'm having trouble understanding the expressions of both a and b in number 3. Thanks!

2. Suppose A= {a, b} and B = {a,b,c}. What is A B? Axb = {aa, at, ac, ba, bb,bc} 3. Suppose L = {ab, bcb, ac} and M = {bac, a, ca} a. Name two strings in L* M* Alabac b. Name two strings in L* - M* ab, bob C. Name two strings in LLM acaciajababbal ababba albeobac