Three youths standing at the top of stairs talking.
Three kids talking.
Kids are youths.
exists e1 e2 x1 x2 x3 x4 x5.(n_top(x3) & a_topic(x1) & at(e1,x3) & of(x3,x4) & Actor(e2,x5) & v_talk(e2) & (x4 = x5) & n_stair(x4) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_youth(x1) & card_eq_3(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_kid(x1) & card_eq_3(x1))