Let A-f a, b, c, d, e, f, g), and B (p, q, r. Give 2 different relations Ri and R2 on A that are symmetric and transitive but not reflexive. List all the elements of the relation R3-{(x,y)I x c y)s P(B) x P(B). List all the elements and draw the digraph of the relation R4 SAxA on A, whose binary 01 0 10 0 0 0 0 0 0 10 matrix representation is given by: Ma = 0 0 0 1 1 11 N 0 (the ordering is given listing of A's members) 0 01000 o00000 What is the symmetric closure of R4? What is it for R3