There is a red truck behind the horses.
There are horses in front of the red truck.
If there is a "red truck behind the horses" then obviously there are "horses in front of the red truck."
exists p1 x1 x3.(n_horse(x3) & exists s1 x2.((x1 = x2) & behind(x2,x3) & n_truck(x2) & a_red(s1) & Theme(s1,x2)))
exists p1 s1 x1 x4.(n_truck(x4) & a_red(s1) & Theme(s1,x4) & exists x2 x3.((x1 = x2) & in(x2,x3) & of(x3,x4) & n_front(x3) & n_horse(x2)))