People are clustered together on a city street.
The street is empty.
There are people clustered together on the street not an empty street.
exists e1 s1 x1 x2 x3.(on(e1,x2) & n_street(x2) & of(x2,x3) & n_city(x3) & a_together(s1) & Manner(e1,s1) & Theme(e1,x1) & v_cluster(e1) & n_people(x1))
exists s1 x1.(n_street(x1) & Theme(s1,x1) & a_empty(s1))