Police officers patrolling a beach.
A fire fighter is walking on a tight rope
Police officers is not the same as fire fightter
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_patrol(e1) & n_beach(x3) & n_officer(x1) & of(x1,x2) & n_police(x2))
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_rope(x3) & a_tight(s1) & Theme(s1,x3) & Actor(e1,x1) & v_walk(e1) & n_fighter(x1) & of(x1,x2) & n_fire(x2))