Two dogs running near a river while one dogs in swimming in it.
The dogs are playing and chasing each other.
Dogs playing and chasing each other aren't just two or three dogs running near or swimming in a river.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x1) & n_thing(x1) & in(e1,x5) & n_swimming(x5) & while(e1,x4) & n_dog(x4) & card_eq_1(x4) & near(e1,x3) & n_river(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1) & card_eq_2(x1))
exists x1.(n_dog(x1) & all x3.(n_other(x3) -> exists e2.(Theme(e2,x3) & Actor(e2,x1) & v_chase(e2))) & all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1))))