Two people ride together on a motorcycle
The people are walking
The 2 people cannot be both riding and walking
exists e1 s1 x1 x2.(on(e1,x2) & n_motorcycle(x2) & a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_ride(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1.(n_people(x1) & Actor(e1,x1) & v_walk(e1))