Two girls talking while sitting on the stairs.
The girls are walking on the road
Talking and walking are not the same activity.
exists e1 e2 x1 x2 x3.(n_stair(x3) & a_topic(x1) & while(e1,e2) & on(e2,x3) & Actor(e2,x2) & v_sit(e2) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_road(x2) & n_girl(x1) & on(e1,x2) & Actor(e1,x1) & v_walk(e1))