Need help please

Instead of removing the object from the mold by a single translation, we can also try to remove it by a single rotation. For simplicity, let's consider the planar variant of this version of the casting problem, and let's only look at clockwise rotations.

a. Give an example of a simple polygon P with top facet f that is not castable when we require that P should be removed from the mold by a single translation, but that is castable using rotation around a point. Also give an example of a simple polygon P with top facet f that is not castable when we require that P should be removed from the mold by a rotation, but that is castable using a single translation.