A long line of off-road vehicles on a mountain trail
There are many vehicles in this picture.
There are many vehicle refers to off-road vehicles.
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & on(x1,x3) & n_trail(x3) & of(x3,x4) & n_mountain(x4) & of(x1,x2) & n_vehicle(x2) & a_off-road(s2) & Theme(s2,x2) & n_line(x1) & a_long(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_picture(x2) & in(p1,x2) & exists x3.((x1 = x3) & n_vehicle(x3) & n_quantity(x3)))