also, as mentioned in the other thread (seems to be locked now), the adjustments of the main diagonal by themselves are sufficient to find the solution with no effort at all:
shell 1-liner
$ zcat words_alpha.txt.gz | grep -i -E -e '^[c-k][a-i][e-m][g-o][h-p][d-l][c-k][a-i][p-x]$'