The children are near a large pile of sand that is next to the water.
The children are in the water.
If the children are next to the water they are not in the water.
exists p1 x1 x5.(n_water(x5) & n_child(x1) & exists s1 s2 x2 x3 x4.(near(x1,x2) & of(x2,x3) & to(s2,x5) & Theme(s2,x4) & a_next(s2) & (x3 = x4) & n_sand(x3) & n_pile(x2) & a_large(s1) & Theme(s1,x2)))
exists p1 x1 x2.(n_water(x2) & n_child(x1) & in(x1,x2))