A boy and girl play in water.
A boy and girl play in the mud.
A boy and girl can not play in water and mud simultaneously.
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_water(x4) & n_play(x1) & of(x1,x3) & n_girl(x3) & of(x1,x2) & n_boy(x2))
exists x1 x2 x3 x4.(n_mud(x4) & a_topic(x1) & in(x1,x4) & n_play(x1) & of(x1,x3) & n_girl(x3) & of(x1,x2) & n_boy(x2))