Composition of relations expressed as a set of pairs.

Here are two relations defined on the set {a, b, c, d}:

S = { (a, b), (a, c), (c, d), (c, a) }

R = { (b, c), (c, b), (a, d), (d, b) }

Write each relation as a set of ordered pairs.

(a)

S R

(b)

R S

(c)

S S

(d)

R R