A red streetcar is on the street.
A car is on the street.
It has already been stated that the car is on the street.
exists p1 s1 x1 x2.(n_street(x2) & on(x1,x2) & n_streetcar(x1) & a_red(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_street(x2) & on(x1,x2) & n_car(x1))