Officer in riot gear observes demonstration.
officer observes demonstration
Officer in riot gear of a type of officer.
exists e1 x1 x2 x3 x4.(ne_nam_officer(x1) & Theme(e1,x4) & Actor(e1,x1) & v_observe(e1) & n_demonstration(x4) & in(x1,x2) & n_gear(x2) & of(x2,x3) & n_riot(x3))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_observe(e1) & n_demonstration(x2) & n_officer(x1))