A group of people riding bikes and walking across a road in the city.
A group of people are on bikes and on foot on the hang glider.
You cannot be walking across a road and on a hang glider. You cannot use a hang glider while on a bike.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(n_city(x7) & a_topic(x1) & in(e2,x7) & across(e2,x6) & n_road(x6) & Actor(e2,x5) & v_walk(e2) & (x1 = x5) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & (x1 = x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1 x2 x5 x6.(n_glider(x5) & of(x5,x6) & n_hang(x6) & exists x3 x4.(on(x1,x4) & on(x4,x5) & n_foot(x4) & on(x1,x3) & n_bike(x3)) & of(x1,x2) & n_people(x2) & n_group(x1))