A man and a woman greeting each other on bikes in front of a building.
People on bikes by a building.
The people are greeting each other on bikes since they are on the bikes.
exists s1 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & all x4.(n_other(x4) -> exists e1 x5 x6 x7.(in(e1,x6) & of(x6,x7) & n_building(x7) & n_front(x6) & on(e1,x5) & n_bike(x5) & Theme(e1,x4) & Actor(e1,x3) & v_greet(e1))) & (x2 = x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & by(x2,x3) & n_building(x3) & n_bike(x2) & n_people(x1))