A mannequin behind a blue car.
There is a mannequin behind a car.
If the mannequin is behind a blue car, it is behind a regular car. Color does not matter here.
exists s1 x1 x2.(a_topic(x1) & behind(x1,x2) & n_car(x2) & a_blue(s1) & Theme(s1,x2) & n_mannequin(x1))
exists p1 x1 x2 x3.((x1 = x2) & behind(x2,x3) & n_car(x3) & n_mannequin(x2))