Employees on stepladders clean the glass doors of a business.
The doors are dirty.
Just because employees clean the glass doors it does not mean the doors are dirty.
exists e1 x1 x2 x3 x4 x5.(n_door(x3) & of(x3,x4) & n_glass(x4) & Theme(e1,x3) & Actor(e1,x1) & v_clean(e1) & of(x3,x5) & n_business(x5) & on(x1,x2) & n_stepladder(x2) & n_employee(x1))
exists s1 x1.(n_door(x1) & Theme(s1,x1) & a_dirty(s1))