Question 5 (2 points) Let A - (a,b) and R ={(x,y) | X,Y E A Ax and y end with the same letter. ). Suppose that the empty string is in the equivalence class 1 and a is in class 2. Assign other elements to equivalence classes (if there is a choice, assign a smaller element to a smaller-numbered class; you do not have to use all possible choices). ab 1. Class 1 aa