Two girls cleaning a floor.
Two girls washing windows.
People can not be cleaning windows and a floor at the same time.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_clean(e1) & n_floor(x3) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wash(e1) & n_window(x3) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))