Children hang on a wall next to water.
Children sit on a couch.
The children can't hang on a wall and sit on a couch at the same time.
exists x1 x2 x3 x4 x5.(a_topic(x1) & on(x1,x3) & to(x4,x5) & n_water(x5) & next(x3,x4) & n_thing(x4) & n_wall(x3) & n_hang(x1) & (x1 = x2) & ne_nam_children(x2))
exists e1 x1 x2.(on(e1,x2) & n_couch(x2) & Actor(e1,x1) & v_sit(e1) & n_child(x1))