Two people are talking at an art gallery.
While at the art gallery two people are having a discussion.
Talking or having a discussion defines that they are talking about something.
exists e1 x1 x2 x3.(at(e1,x2) & n_gallery(x2) & of(x2,x3) & n_art(x3) & Actor(e1,x1) & v_talk(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(n_gallery(x3) & of(x3,x4) & n_art(x4) & at(e1,x3) & r_while(e1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_discussion(x2) & n_people(x1) & card_eq_2(x1))