A man is holding a baby in a sling.
The man is not holding the baby.
You cannot be both holding and not holding.
exists e1 x1 x2 x3.(in(e1,x3) & n_sling(x3) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_baby(x2) & n_man(x1))
exists x1 x2.(n_baby(x2) & n_man(x1) & -exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1)))