premise: A racer on a motorcycle lifts one hand in the air.
hypothesis: A person on a motorcycle.
explanation_1: a person who is a racer on a motorcycle lifts one hand
explanation_2: A racer on a motorcycle is a person on motorcycle.
explanation_3: A racer is a person. The person/racer is on a motorcycle.
premise_logic: exists e1 x1 x2 x3 x4.(n_air(x4) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_lift(e1) & n_hand(x3) & card_eq_1(x3) & on(x1,x2) & n_motorcycle(x2) & n_racer(x1))
hypothesis_logic: exists x1 x2.(a_topic(x1) & on(x1,x2) & n_motorcycle(x2) & n_person(x1))