Two friends ride a bicycle.
People in a bike event.
Does not mean the friends are at an event.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2) & n_friend(x1) & card_eq_2(x1))
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_event(x2) & of(x2,x3) & n_bike(x3) & n_people(x1))