4Pollo, would you mind making those corrections on your grid and reposting. I'm not adept with the style and formatting on bitcointalk.

Also, just to clarify, here is the distribution I've found, slightly bit different from other postings. Again, not sure it matters, because frequency analysis doesn't seem to work:

12 1b
11 6b
10 7a
     3b
     3d
8   1a
     8a
     9b
     7b
     7d
7   2a
     6a
     9a
     8d
     2b
6   8b
     6d
5   4b
     5b
     5a
     2d
     4d
4   3a
     4a
     1d
     5d
0   9d

TOTAL: 26 distinct blocks [edited]