A group of kids look out of a fence.
Nobody is looking.
Either nobody is looking or the kids are looking out of the fence.
exists e1 x1 x2 x3.(r_out(e1) & of(e1,x3) & n_fence(x3) & Actor(e1,x1) & v_look(e1) & of(x1,x2) & n_kid(x2) & n_group(x1))
-exists e1 x1.(Actor(e1,x1) & v_look(e1) & n_person(x1))