The two shots in the diagram were being discussed in another thread, but that seems to have gotten bogged down in metadiscussions.

Shot 1 is to make the 1 ball go backwards into the pocket. This shot depends mostly on the setup.
Shot 2 is to make the back ball of a spotted pair of balls straight into the corner pocket. This is a common situation at one pocket. How many ways can you come up with to do this? (On many tables, the third spotted ball is barely makeable by a "normal" shot, but the second is usually considered very difficult to impossible.)

Shot 1 is to make the 1 ball go backwards into the pocket. This shot depends mostly on the setup.
Shot 2 is to make the back ball of a spotted pair of balls straight into the corner pocket. This is a common situation at one pocket. How many ways can you come up with to do this? (On many tables, the third spotted ball is barely makeable by a "normal" shot, but the second is usually considered very difficult to impossible.)