A girl is holding a birthday cake.
A girl is doing jumping jacks.
One cannot be holding a birthday cake and doing jumping jacks simultaneously.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_cake(x2) & of(x2,x3) & n_birthday(x3) & n_girl(x1))
exists e2 e1 x1 x2.(Theme(e2,x2) & Actor(e2,x1) & v_do(e2) & n_jack(x2) & Actor(e1,x2) & v_jump(e1) & n_girl(x1))