A cattle dog nips the leg of an animal.
A dog grabs a stick.
There can be either a dog that nips the leg of an animal or a dog that grabs a stick.
exists e1 x1 x2 x3 x4.(n_leg(x3) & Theme(e1,x3) & Actor(e1,x1) & v_nip(e1) & of(x3,x4) & n_animal(x4) & n_dog(x1) & of(x1,x2) & n_cattle(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_grab(e1) & n_stick(x2) & n_dog(x1))