Two bike riders and four people travel near an intersection.
A person sits alone on the side of the street.
If a person sits alone then there are no two bikers and four people on a trip.
exists e1 x1 x2 x3 x4 x5.(near(e1,x5) & n_intersection(x5) & Actor(e1,x1) & v_travel(e1) & subset_of(x4,x1) & n_people(x4) & card_eq_4(x4) & subset_of(x2,x1) & n_rider(x2) & of(x2,x3) & n_bike(x3) & card_eq_2(x2))
exists e1 s1 x1 x2 x3.(n_street(x3) & n_side(x2) & on(e1,x2) & of(x2,x3) & a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_person(x1))