Four females stand on the tip of their toes while practicing ballet in front of a black backdrop.
Four ballet dancers prepare for a photo.
Standing on their toes in front of a backdrop does not necessarily imply to prepare for a photo.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(n_toe(x3) & of(x3,x2) & n_thing(x2) & n_tip(x2) & while(e1,e2) & in(e2,x5) & of(x5,x6) & n_backdrop(x6) & a_black(s1) & Theme(s1,x6) & n_front(x5) & Theme(e2,x4) & Actor(e2,x1) & v_practice(e2) & n_ballet(x4) & on(e1,x2) & of(x2,x3) & Actor(e1,x1) & v_stand(e1) & n_female(x1) & card_eq_4(x1))
exists e1 x1 x2 x3.(for(e1,x3) & n_photo(x3) & Actor(e1,x1) & v_prepare(e1) & n_dancer(x1) & of(x1,x2) & n_ballet(x2) & card_eq_4(x1))