A child is standing on her head.
The child is standing upright.
The child can either stand on her head or upright but not both
exists e1 x1 x2.(on(e1,x2) & n_head(x2) & of(x2,x1) & n_female(x1) & Actor(e1,x1) & v_stand(e1) & n_child(x1))
exists e1 x1 x2.(n_child(x1) & Time(e1,x2) & n_upright(x2) & Actor(e1,x1) & v_stand(e1))