Girl in hallway vacuuming
A girl cleans.
A girl cleans through vacuuming.
exists e1 s1 x1 x2.(ne_nam_girl(s1) & a_topic(s1) & in(s1,x1) & Actor(e1,x2) & v_vacuum(e1) & (x1 = x2) & n_hallway(x1))
exists x1 x2.(a_topic(x1) & n_clean(x1) & of(x1,x2) & n_girl(x2))