Exercise 7: Let the relations RI = {(1, x), (1, y), (2, x), (3, x)); R2 {(x, b), (y, b), (y, a), (y, c)} Ordering ofX -{1,2,3), Y- {x, y) and Z - fa, b, c 1. Find the matrix A1 of the relation R1 2. Find the matrix A2 of the relation R'2 3. Find the matrix product A1 A2 4. Find the relation R2 o R1 5. Find the matrix of the relation R2 o R1