33. Let R be the relation on the set of people consisting of pairs (a, b), where a is a parent of b. Let S be the relation on the set of people consisting of pairs (a, b), where a and b are siblings (brothers or sisters). What are S oR and R o S? Exercises 34 37 deal with these relations on the set of real numbers: Ri R2 la, b) eRab, the "greater than" relation. 1(d, b) E R 2 I a > b, the-greater than or equal to" t