Protesting youth relax in metro park, observed by armed police.
The youths are not at home.
The youths are either protesting or not.
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 x1.(n_youth(x1) & -exists p1 x2.(at(x1,x2) & n_home(x2)))