Two boys playing in water.
People playing in water.
Boys are people, therefore people are playing in water.
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) & in(e1,x3) & n_water(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_people(x1))