A baby playing in the tub.
A baby in a playpen.
The baby cannot be in a tub and a play pen at the same time.
exists x1 x2 x3.(n_tub(x3) & a_topic(x1) & in(x1,x3) & n_playing(x1) & of(x1,x2) & n_baby(x2))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_playpen(x2) & n_baby(x1))