Masked protester surrounded by the police.
Police officers and anothe person are near each other.
protester usually standing next to each other so these  are protester.
exists e1 x1 x2 x3.(n_police(x3) & Actor(e1,x3) & Theme(e1,x1) & v_surround(e1) & n_protester(x1) & (x1 = x2) & ne_nam_masked(x2))
exists p1 s1 x1 x2 x3 x4.(all x5.(n_other(x5) -> near(x1,x5)) & n_person(x4) & a_anothe(s1) & Theme(s1,x4) & n_officer(x3) & subset_of(x4,x1) & subset_of(x3,x1) & of(x1,x2) & n_police(x2))