Three children pose for a picture.
Children are taking a selfie.
Just because children pose for a picture doe snot mean that they are taking a selfie.
exists e1 x1 x2.(for(e1,x2) & n_picture(x2) & Actor(e1,x1) & v_pose(e1) & n_child(x1) & card_eq_3(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_selfie(x2) & n_child(x1))