The night sky in the desert.
Its night in the desert
You can only see the night sky, at night.
exists x1 x2 x3.(n_desert(x3) & n_sky(x1) & of(x1,x2) & n_night(x2) & a_topic(x1) & in(x1,x3))
exists x1 x2 x3.(n_desert(x3) & n_night(x2) & of(x2,x1) & n_thing(x1) & a_topic(x2) & in(x2,x3))