premise: A person attempts to rope a black cow while riding a horse.
hypothesis: The person is on a horse.
explanation_1: To be on a horse the person is riding a horse.
explanation_2: A person riding a horse is on a horse.
explanation_3: "A person on a horse" is a rephrasing of "A person riding a horse".
premise_logic: exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_attempt(e1) & exists e2 e3 s1 x2 x3.(while(e2,e3) & Theme(e3,x3) & Actor(e3,x1) & v_ride(e3) & n_horse(x3) & Theme(e2,x2) & Actor(e2,x1) & v_rope(e2) & n_cow(x2) & a_black(s1) & Theme(s1,x2)) & n_person(x1))
hypothesis_logic: exists p1 x1.(n_person(x1) & exists x2.(on(x1,x2) & n_horse(x2)))