Four boys are in the living room talking.
A group of boys are talking with each other.
Four boys can be called a group.
exists p1 x1 x2 x3.(n_room(x2) & of(x2,x3) & n_living(x3) & exists e1 x4.(in(x1,x2) & Actor(e1,x4) & v_talk(e1) & (x2 = x4)) & n_boy(x1) & card_eq_4(x1))
exists e1 x1 x2.(all x3.(n_other(x3) -> with(e1,x3)) & Actor(e1,x1) & v_talk(e1) & of(x1,x2) & n_boy(x2) & n_group(x1))