premise: Three motor-cross bike racers in a competition.
hypothesis: Three people are racing bikes for a prize.
explanation_1: Not all competitions end with a prize.
explanation_2: we are unable to  say for certain that the people are racing for a prize.
explanation_3: The bike racers may not necessarily be racing for a prize.
premise_logic: exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_competition(x4) & n_racer(x1) & of(x1,x3) & n_bike(x3) & of(x1,x2) & n_motor-cross(x2) & card_eq_3(x1))
hypothesis_logic: exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_race(e1) & for(x2,x3) & n_prize(x3) & n_bike(x2) & n_people(x1) & card_eq_3(x1))