a black dog plays in the water.
A brown calf plays in the water.
It is either a black dog or a brown calf, not both.
exists s1 x1 x2 x3.(n_water(x3) & a_topic(x1) & in(x1,x3) & n_play(x1) & of(x1,x2) & n_dog(x2) & a_black(s1) & Theme(s1,x1))
exists s1 x1 x2 x3.(n_water(x3) & a_topic(x1) & in(x1,x3) & n_play(x1) & of(x1,x2) & n_calf(x2) & a_brown(s1) & Theme(s1,x1))