premise: A boy kneeling on a skateboard riding down the street
hypothesis: A boy standing upright on a skateboard.
explanation_1: The boy is either kneeling or standing upright but not both at the same time.
explanation_2: A boy cannot be standing upright while simultaneously kneeling.
explanation_3: If he is kneeling, then he cannot possibly be standing upright.
premise_logic: exists e1 e2 x1 x2 x3 x4 x5.(n_street(x5) & a_topic(x1) & on(e1,x3) & down(e2,x5) & Actor(e2,x4) & v_ride(e2) & (x3 = x4) & n_skateboard(x3) & Actor(e1,x2) & v_kneel(e1) & (x1 = x2) & n_boy(x1))
hypothesis_logic: exists e1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_skateboard(x3) & n_upright(x1) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_boy(x2))
premise_sim: exists e1 e2 x1 x2 x3 x4 x5.(v_ride(e2) & v_kneel(e1) & on(e1,x3) & n_street(x5) & n_skateboard(x3) & n_boy(x1) & down(e2,x5) & a_topic(x1) & Actor(e2,x4) & Actor(e1,x2) & (x3 = x4) & (x1 = x2))
hypothesis_sim: exists e1 x1 x2 x3.(v_stand(e1) & on(x1,x3) & of(x1,x2) & n_upright(x1) & n_skateboard(x3) & n_boy(x2) & a_topic(x1) & Actor(e1,x1))