Pick a group of n different letters, and in turn add A, B, ..., Z to these. How many of these enlarged groups can be transposed into words? More interestingly, what is the most fecund such letter group? This is an example of a logological problem best attacked by computer. To illustrate the possibilities, I list below the best letter groups of two through eight letters which can be enlarged to words found in the Official Scrabble Players' Dictionary.
"Transaddable Letter Groups,"
Word Ways: Vol. 17
, Article 12.
Available at: https://digitalcommons.butler.edu/wordways/vol17/iss1/12