Two swans swimming in the water.
Swans walking on land.
It is not possible to be walking on land and swimming in water at the same time.
exists x1 x2 x3.(n_water(x3) & a_topic(x1) & in(x1,x3) & n_swimming(x1) & of(x1,x2) & n_swan(x2) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_land(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_swan(x1))