A security officer and a man stand in front of a building.
A security officer stands alone in front of a building.
There is either a security officer and a man, or a security officer standing alone.
exists s1 x1 x2 x3 x4 x5 x6.(a_topic(s1) & subset_of(x3,s1) & in(x3,x5) & of(x5,x6) & n_building(x6) & n_front(x5) & n_stand(x3) & of(x3,x4) & n_man(x4) & subset_of(x1,s1) & n_officer(x1) & of(x1,x2) & n_security(x2))
exists e1 s1 x1 x2 x3 x4.(in(e1,x3) & of(x3,x4) & n_building(x4) & n_front(x3) & a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & n_officer(x1) & of(x1,x2) & n_security(x2))