The dogs are walking in the desert.
The dogs are walking to the water in the desert.
The dogs are looking for water.
exists e1 x1 x2.(n_desert(x2) & n_dog(x1) & in(e1,x2) & Actor(e1,x1) & v_walk(e1))
exists e1 x1 x2 x3.(n_desert(x3) & n_water(x2) & n_dog(x1) & in(e1,x3) & to(e1,x2) & Actor(e1,x1) & v_walk(e1))