A brown dog running
A cat relaxes.
An animal can't be a dog and a cat
exists e1 s1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists e1 x1.(Actor(e1,x1) & v_relax(e1) & n_cat(x1))