1: Pie with internal labels.
2: Pie with external labels and precision=0.
3: Pie with `labelStyle="columns"`, a constant radius, and a `0` plot value.
4/5: Two pies with internal and external labels with a constant radius.
6/7: Pie with internal custom labels and custom colors (#7 is rotated).
8: Degenerated pie with 1 element.
9: Degenerated pie with 1 positive elements (out of 5).
10: Pie with no data.
11: Pie with all data zero (no data).
12: Pie with all data zero (no data) and a message.
That's all Folks!