A girl sitting on a horse is by a tree with a silver star and silver balls.
Girl rides a black stallion.
Not all horses are black. A stallion means it's a male horse and not all horses are male
exists e1 p1 x1 x2 x3.(exists x4 x5 x6 x7 x8 x9.(by(x1,x4) & with(x4,x5) & subset_of(x8,x5) & n_ball(x8) & of(x8,x9) & n_silver(x9) & subset_of(x6,x5) & n_star(x6) & of(x6,x7) & n_silver(x7) & n_tree(x4)) & on(e1,x3) & n_horse(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_girl(x1))
exists e1 s1 x1 x2.(ne_nam_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_stallion(x2) & a_black(s1) & Theme(s1,x2))