| Fri, 27 May 2011 13:43:20 -0600 | Kevin Walker | start to rearrange n-cat defs | file | diff | annotate |
| Wed, 25 May 2011 11:08:16 -0600 | Kevin Walker | corrected statement of module to category restrictions; note that this affects the numbering of items in subsection 6.4 | file | diff | annotate |