People standing in front of yellow building with the words "YOU ARE HERE" hanging upside down.
The people know each other.
Just because people are standing together doesn't mean they know each other.
exists e1 e2 p1 p2 s1 s2 x1 x2 x3 x4 x5.(n_person(x5) & n_word(x5) & exists s3.(r_upside(s3) & Theme(s3,x1) & a_down(s3)) & Topic(e2,p2) & Actor(e2,x1) & v_hang(e2) & with(e1,x5) & a_here(s2) & Manner(p1,s2) & exists x6.(x5 = x6) & in(e1,x3) & of(x3,x4) & n_building(x4) & a_yellow(s1) & Theme(s1,x4) & n_front(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1))
exists x1.(n_people(x1) & all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_know(e1))))