A group of men are changing the shells on a cannon.
The men are eating their meals.
They cannot be changing the shells and eating their meals simultaneously.
exists e1 x1 x2 x3 x4.(n_shell(x3) & on(e1,x4) & n_cannon(x4) & Theme(e1,x3) & Actor(e1,x1) & v_change(e1) & of(x1,x2) & n_man(x2) & n_group(x1))
exists e1 x1 x2.(n_meal(x2) & of(x2,x1) & n_thing(x1) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1))