A group of four items is selected from seven items—G, H, I, J, K, L, and M—according to the following rules:
Either G or I must be selected.
Either H or K must be selected.
Neither K nor I can be selected with H.
Neither L nor G can be selected unless the other is also selected.
There would be only one possible way to select the four items if which of the following restrictions were added to the original set of conditions?