People stopped at a street vendor.
The street vendor is selling hot dogs.
Not all street vendors are selling hot dogs.
exists e1 x1 x2 x3.(at(e1,x2) & n_vendor(x2) & of(x2,x3) & n_street(x3) & Actor(e1,x1) & v_stop(e1) & n_people(x1))
exists e1 s1 x1 x2 x3.(n_vendor(x1) & of(x1,x2) & n_street(x2) & Theme(e1,x3) & Actor(e1,x1) & v_sell(e1) & n_dog(x3) & a_hot(s1) & Theme(s1,x3))