Three women sharing a laugh while sitting on stairs.
Some people laughing at a knock-knock joke while sitting on stairs.
Not all people are laughing at a knock-knock joke.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & while(e1,e2) & on(e2,x4) & n_stair(x4) & Actor(e2,x2) & v_sit(e2) & Theme(e1,x3) & Actor(e1,x2) & v_share(e1) & n_laugh(x3) & (x1 = x2) & n_woman(x1) & card_eq_3(x1))
exists e1 e2 s1 x1 x2 x3 x4.(a_topic(x1) & while(e1,e2) & on(e2,x4) & n_stair(x4) & Actor(e2,x2) & v_sit(e2) & at(e1,x3) & n_joke(x3) & a_knock-knock(s1) & Theme(s1,x3) & Actor(e1,x2) & v_laugh(e1) & (x1 = x2) & n_people(x1))