Let A = {a, b, c, d}, B = {1, 2, 3, 4}, and C = {u, x, y, z}. Let R = {(a, 1), (b, 3), (c, 1), (d, 4)} be a relation from A to B. Let S be a relation {(1, x), (2, u), (2, z), (3, y), (4, y)} from B to C. Find the composition relation SoR. You must use matrices to find the answer. Write the final answer as set of pairs.