premise: A man rides a black motorcycle while wearing a helmet and a van rides beside him in the distance.
hypothesis: A man rides a white horse while wearing a cowboy hat and a another horse rides beside him.
explanation_1: A man cannot be riding a horse and a motorcycle at the same time and the form of transport cannot be both clearly white as well as black.  Furthermore the man cannot be wearing both a helmet and a cowboy hat.
explanation_2: A black motorcycle and white horse are two different objects. A helmet is not the same as a cowboy hat. A van is not the same as a horse.
explanation_3: A man can't be riding a motorcycle and a horse at the same time.
premise_logic: exists e2 e1 e3 s1 s2 x1 x2 x3 x4 x5.(n_distance(x5) & in(e3,x5) & a_beside(s2) & Manner(e3,s2) & Theme(e3,x1) & Actor(e3,x4) & v_ride(e3) & n_male(x1) & n_van(x4) & while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_wear(e2) & n_helmet(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_motorcycle(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
hypothesis_logic: exists e2 e1 e3 s1 x1 x2 x3 x4 x5.(beside(e3,x1) & n_male(x1) & Actor(e3,x5) & v_ride(e3) & n_horse(x5) & while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_wear(e2) & n_hat(x3) & of(x3,x4) & n_cowboy(x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & a_white(s1) & Theme(s1,x2) & n_man(x1))