Chefs sit against a wall.
The undertaker is crying.
Chefs and undertaker are different.
exists e1 x1 x2.(against(e1,x2) & n_wall(x2) & Actor(e1,x1) & v_sit(e1) & n_chef(x1))
exists e1 x1.(n_undertaker(x1) & Actor(e1,x1) & v_cry(e1))