Two girls are walking along the street and talking.
There are people discussing politics on a stroll.
People walking on the street and talking do not always discuss politics.
exists e2 e1 x1 x2 x3.(n_street(x2) & Actor(e2,x3) & v_talking(e2) & n_girl(x3) & card_eq_2(x3) & along(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_girl(x1) & card_eq_2(x1))
exists p1 x1 e1 x2 x3 x4 x5.((x1 = x2) & on(e1,x5) & n_stroll(x5) & Theme(e1,x4) & Actor(e1,x3) & v_discuss(e1) & n_politics(x4) & (x2 = x3) & n_people(x2))