Children in swimming suits playing in water.
The children are playing in the snow.
If the children are in water then they are not in the snow.  People do not wear swimming suits in the snow.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & in(e1,x5) & n_water(x5) & Actor(e1,x4) & v_play(e1) & (x2 = x4) & n_suit(x2) & of(x2,x3) & n_swimming(x3) & n_child(x1))
exists e1 x1 x2.(n_snow(x2) & n_child(x1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))