Two people are swimming in a pool with a ball.
two people running .
Two people swimming and two people running are different.
exists e1 x1 x2 x3.(in(e1,x3) & n_pool(x3) & with(e1,x2) & n_ball(x2) & Actor(e1,x1) & v_swim(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))