Protesters are holding signs that say stop killing in Iran.
Protesters are holding things.
Signs are things, so protesters holding signs are protestors holding things.
exists e1 e2 p1 x1 x2 x3 x5.(ne_geo_iran(x5) & Theme(e2,x2) & Actor(e2,x1) & v_hold(e2) & exists e3 x4.(in(e3,x5) & Theme(e3,x4) & Actor(e3,x3) & v_stop(e3) & n_kill(x4)) & Topic(e1,p1) & Actor(e1,x3) & v_say(e1) & (x2 = x3) & n_sign(x2) & n_protester(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_thing(x2) & n_protester(x1))