There is a red truck behind the horses.
There is a blue truck outside
Either the truck is red or blue.
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 x1 s1 x2 x3.((x1 = x2) & n_outside(x2) & of(x2,x3) & n_truck(x3) & a_blue(s1) & Theme(s1,x2))