A group of children in the ocean.
The children are in the water.
The ocean is water.
exists x1 x2 x3.(n_ocean(x3) & a_topic(x1) & in(x1,x3) & of(x1,x2) & n_child(x2) & n_group(x1))
exists p1 x1 x2.(n_water(x2) & n_child(x1) & in(x1,x2))