Protesting youth relax in metro park, observed by armed police.
Youth are protesting in the park.
protesting youth can be rephrased as youth are protesting
exists e2 e3 e1 s1 x1 x2 x3 x4.(for(e2,e3) & Actor(e3,x4) & n_police(x4) & a_armed(s1) & Theme(s1,x4) & Theme(e3,x1) & v_observe(e3) & in(e2,x2) & n_park(x2) & of(x2,x3) & n_metro(x3) & Actor(e2,x1) & v_relax(e2) & n_youth(x1) & Actor(e1,x1) & v_protest(e1))
exists e1 x1 x2.(n_park(x2) & ne_nam_youth(x1) & in(e1,x2) & Actor(e1,x1) & v_protest(e1))