Dmitri Borgmann's second book, Beyond Language (Scribner's), was published in 1967. One of the articles in this book which particularly fascinated us was that entitled Zero Redundancy. Borgmann points out that the first letter of a word may be any one of 26; the second letter may also be any one of 26. Therefore, there are 26 x 26 ( = 676) different two-letter combinations with which a word can begin.
"Zero Redundancy Rides Again,"
Word Ways: Vol. 3
, Article 7.
Available at: https://digitalcommons.butler.edu/wordways/vol3/iss3/7