A child and woman exchange glances.
a bird was on rocks
The subject is either a bird or a child.
exists s1 x1 x2 x3 x4.(a_topic(s1) & n_glance(x2) & of(x2,x4) & n_exchange(x4) & of(x2,x3) & n_woman(x3) & n_child(x1) & subset_of(x2,s1) & subset_of(x1,s1))
exists p1 x1.(exists x2.(on(x1,x2) & n_rock(x2)) & n_bird(x1))