A man is walking along a beach.
A woman is walking along a beach.
It is either a man walking along the beach or a woman walking along the beach.
exists e1 x1 x2.(along(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists e1 x1 x2.(along(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_walk(e1) & n_woman(x1))