premise: A man riding a dirt bike on a racetrack.
hypothesis: A man is riding a dirt bike.
explanation_1: A man is riding a dirt bike is less descriptive than a man riding a dirt bike on a racetrack.
explanation_2: To ride a dirt bike, you need to be on a racetrack.
explanation_3: Both sentences state that a man is riding a dirt bike.
premise_logic: exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & on(e1,x5) & n_racetrack(x5) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & of(x3,x4) & n_dirt(x4) & (x1 = x2) & n_man(x1))
hypothesis_logic: exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & n_man(x1))