Officer in riot gear observes demonstration.
the officer is a former marine
officer is it
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 p1 x1.(n_officer(x1) & exists s1 x2.((x1 = x2) & n_marine(x2) & a_former(s1) & Theme(s1,x2)))