Two men working on a window.
Two men contemplate which windows to clean.
No evidence the windows need clean. Window could be broke.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_window(x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
(x)