A bunch of kids playing with water.
boys and girls playing with water
The kids may be either all boys, all girls, or a mix.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & with(e1,x4) & n_water(x4) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_kid(x2) & n_bunch(x1))
exists e1 s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & with(e1,x4) & n_water(x4) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_girl(x2) & subset_of(x1,s1) & n_boy(x1))