This article contains an alphabetical listing of approximately 6,530 trigrams (sets of three consecutive letters) occurring in English words - about 37 percent of the 17,576 theoretically possible trigram arrangements. For each trigram listed, one or more of the commonest English words containing that trigram are included.
Eckler, A. Ross and Eckler, Faith W.
"A Dictionary of Common English Trigrams,"
Word Ways: Vol. 2
, Article 17.
Available at: http://digitalcommons.butler.edu/wordways/vol2/iss3/17