Two boys playing in water.
Two boys running on water.
They are either playing in or running on, not both
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_water(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_water(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))