A cat bites a human's nose.
A dog bites a human.
There can only be a cat or a dog.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_bite(e1) & n_nose(x3) & of(x3,x2) & n_human(x2) & n_cat(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_bite(e1) & n_human(x2) & n_dog(x1))