| original compilation | 11/28/87 |
| major revision | 08/09/89 |
| further additions | 08/23/89 - 10/21/90 |
| variants added to answer list | 07/04/90 |
| editing and renumbering | 07/25/90 - 11/11/90 |
| items removed; title changed | 09/20/90 - 11/11/90 |
| editing and additions | 02/26/92 - 09/17/92 |
| more additions (incl. biblio.) | 03/31/93 - 05/03/93 |
| still more additions | 08/04/93 |
| minor changes | 02/01/94 |
| major restructuring/additions | 08/08/98 - 08/26/98 |
| new additions/updates | 07/15/99 - 07/18/99 |