A tetragram is a set of four consecutive letters embedded in a word, as ETRA in 'tetragram' or AINT in 'paint'. Is it possible to take four different letters of the alphabet, rearrange these in all possible ways to form 24 different tetragrams, and embed each of these in a boldface word taken from the Merriam-Webster unabridged dictionary? The answer to this is yes; in fact, results for four such completely-permutable sets are presented below.
Eckler, A. Ross
"Complete Tetragram Permutations,"
Word Ways: Vol. 17
, Article 18.
Available at: http://digitalcommons.butler.edu/wordways/vol17/iss2/18