A man installs a sheet glass window.
A man cleans a dirty window.
The window cannot be both installed and cleaned. (installs cleans)
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_install(e1) & n_window(x2) & of(x2,x4) & n_glass(x4) & of(x2,x3) & n_sheet(x3) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_window(x2) & of(x2,x3) & n_dirty(x3) & n_man(x1))