four friends cheerfully jumping off the flight stairs.
The four people are sitting on the stairs for a photo.
One set of people are jumping and the others are sitting you can't be doing both at the same time.
exists e1 s1 s2 x1 x2 x3.(n_stair(x2) & of(x2,x3) & n_flight(x3) & a_cheerfully(s2) & Manner(e1,s2) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_friend(x1) & card_eq_4(x1))
exists e1 x1 x2 x3.(n_stair(x2) & n_people(x1) & card_eq_4(x1) & for(e1,x3) & n_photo(x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))