Two girls laughing within a crowd.
Two girls are laughing at each other while standing in a crowd.
Just because two girl laughing with a crowd does not imply that they are laughing at each other.
exists e1 x1 x2 x3.(a_topic(x1) & within(e1,x3) & n_crowd(x3) & Actor(e1,x2) & v_laugh(e1) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists e2 e1 x1 x2.(while(e1,e2) & in(e2,x2) & n_crowd(x2) & Actor(e2,x1) & v_stand(e2) & all x3.(n_other(x3) -> at(e1,x3)) & Actor(e1,x1) & v_laugh(e1) & n_girl(x1) & card_eq_2(x1))