can anyone help with this

Let R = ((a.a,).(a,.a.).(a,.a,).(a,.a,).(a..a,).(a..a.); be the binary relation defined on A= (a, .a,.a,.a. ) . Find the matrix of the transitive closure of R by using Warshall's algorithm. (7 marks) Given A = {w, x, y,z), B = {1, 2,3, 4} and C = {a, b, c, d]. Let R be a relation from A to B and S be the relation from B to C defined as follows. R = {(w, 2), (x, 3), (y, 3), (y, 4), (z, 1), (z, 2) } S = {(1, a), (1, c), (2, c). (2, d), (3, a), (4, b), (4, d) } Find Msz , M(RUS)-1 and MS.R (8 marks)