LanX,
And I'm stuck finding a formula which calculates all unique solutions

If a letter was allowed to repeat up to the maximum 8 times, the formula is: 

(n + (k - 1))!
--------------
k! (n - 1)!

   33!
--------      = 13_884_156
8! * 25!

[download]

I am not sure how to get from 13_884_156 to 12_461_993 strictly through calculation but it seems like it should be possible.

Cheers - L~R

In reply to Re^7: Challenge: 8 Letters, Most Words by Limbic~Region
in thread Challenge: 8 Letters, Most Words by Limbic~Region

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