Two young sisters pose while sitting on a big red quad.
The sisters are posing for a picture.
Sisters may strike a pose without doing so for a picture.
exists e1 e2 s1 s2 s3 x1 x2.(while(e1,e2) & on(e2,x2) & n_quad(x2) & a_red(s3) & Theme(s3,x2) & a_big(s2) & Theme(s2,x2) & Actor(e2,x1) & v_sit(e2) & Actor(e1,x1) & v_pose(e1) & n_sister(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(n_sister(x1) & for(e1,x2) & n_picture(x2) & Actor(e1,x1) & v_pose(e1))