A tractor is sitting on the beach behind two people sitting in the sand.
the tractor is on the farm
A tractor cannot be on the beach and on the farm at the same time.
exists e1 e2 x1 x2 x3 x4 x5.(n_sand(x5) & n_beach(x2) & behind(e1,x3) & in(e2,x5) & Actor(e2,x4) & v_sit(e2) & (x3 = x4) & n_people(x3) & card_eq_2(x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_tractor(x1))
exists p1 x1 x2.(n_farm(x2) & n_tractor(x1) & on(x1,x2))