A cloudy sky above a busy city street.
The street is not busy at all.
A street cannot simultaneously be busy and not busy.
exists s1 s2 x1 x2 x3.(a_topic(x1) & above(x1,x2) & n_street(x2) & of(x2,x3) & n_city(x3) & a_busy(s2) & Theme(s2,x2) & n_sky(x1) & a_cloudy(s1) & Theme(s1,x1))
exists x1.(n_street(x1) & -exists s1.(all x2.(n_thing(x2) -> at(s1,x2)) & Theme(s1,x1) & a_busy(s1)))