Two girls looking at an informational poster.
Two girls have a Justin Bieber poster.
Two girls can't be looking t both an informational poster and a Justin Bieber poster
exists e1 s1 x1 x2.(at(e1,x2) & n_poster(x2) & a_informational(s1) & Theme(s1,x2) & Actor(e1,x1) & v_look(e1) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_poster(x2) & (x2 = x4) & ne_per_bieber(x4) & (x2 = x3) & ne_per_justin(x3) & n_girl(x1) & card_eq_2(x1))