Two window cleaners clean tall glass building.
Two workers are working on the building.
Window cleaners are workers.
exists s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(s2,x4) & Actor(s2,x3) & a_clean(s2) & n_building(x4) & of(x4,x5) & n_glass(x5) & a_tall(s1) & Theme(s1,x4) & (x1 = x3) & n_cleaner(x1) & of(x1,x2) & n_window(x2) & card_eq_2(x1))
exists e1 x1 x2.(n_building(x2) & on(e1,x2) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & card_eq_2(x1))