premise: A man is riding his dirt bike through the air in the desert.
hypothesis: A man is on a motorbike.
explanation_1: Riding a vehicle is similar to being on a vehicle.  A dirt bike and a motorbike are both bikes.
explanation_2: Riding his dirt bike implies he is on a motorbike.
explanation_3: The man is on a motorbike because he is riding a dirt bike.
premise_logic: exists e1 x1 x2 x3 x4 x5.(n_desert(x5) & n_air(x4) & in(e1,x5) & through(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & of(x2,x1) & n_male(x1) & n_man(x1))
hypothesis_logic: exists p1 x1.(exists x2.(on(x1,x2) & n_motorbike(x2)) & n_man(x1))
premise_sim: exists e1 x1 x2 x3 x4 x5.(v_ride(e1) & through(e1,x4) & of(x2,x3) & of(x2,x1) & n_man(x1) & n_male(x1) & n_dirt(x3) & n_desert(x5) & n_bike(x2) & n_air(x4) & in(e1,x5) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists x1.(n_man(x1) & exists x2.(on(x1,x2) & n_motorbike(x2)))