Two men in black outfits have backpacks.
The two men are friends.
Two men who one sees at the same time aren't necessarily friends.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_backpack(x3) & in(x1,x2) & n_outfit(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1) & card_eq_2(x1))
exists p1 x1.(n_man(x1) & card_eq_2(x1) & exists x2.((x1 = x2) & n_friend(x2)))