Men in orange vests work hard cleaning the windows.
A work crew is cleaning.
Just because there are men in orange vests cleaning the windows, it doesn't necessarily mean that they are a work crew.
exists e1 e2 s1 x1 x2 x3 x4.(n_window(x4) & for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_clean(e2) & a_hard(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_man(x1))
exists e1 x1 x2.(Actor(e1,x1) & v_clean(e1) & n_crew(x1) & of(x1,x2) & n_work(x2))