Chefs sit against a wall.
The person sits at the wall.
chefs are the person and is sitting at the wall
exists e1 x1 x2.(against(e1,x2) & n_wall(x2) & Actor(e1,x1) & v_sit(e1) & n_chef(x1))
exists e1 x1 x2.(n_wall(x2) & n_person(x1) & at(e1,x2) & Actor(e1,x1) & v_sit(e1))