premise: A boy kneeling on a skateboard riding down the street
hypothesis: A boy on a skateboard.
explanation_1: " kneeling on a skateboard " and " on a skateboard.''  mean the same.
explanation_2: Both boy are on a skateboard.
explanation_3: A boy cannot kneel on a skateboard unless boy is on skateboard.
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 x1 x2.(a_topic(x1) & on(x1,x2) & n_skateboard(x2) & n_boy(x1))
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 x1 x2.(on(x1,x2) & n_skateboard(x2) & n_boy(x1) & a_topic(x1))