A group of men are running on a beach.
The men are sitting in the sand.
The group of men cannot be running on a beach and sitting in the sand simultaneously.
exists e1 x1 x2 x3.(on(e1,x3) & n_beach(x3) & Actor(e1,x1) & v_run(e1) & of(x1,x2) & n_man(x2) & n_group(x1))
exists e1 x1 x2.(n_sand(x2) & n_man(x1) & in(e1,x2) & Actor(e1,x1) & v_sit(e1))