Successive transdeletions by a single letter from word to word yield a pyramidic structure, as demonstrated by Ross Eckler in "Two New Transdeletion Pyramids" in the May Word Ways. What if we progressively delete all letters of a single word and transpose the remainder?
"Transdeletion Nests in Chambers,"
Word Ways: Vol. 22
, Article 14.
Available at: http://digitalcommons.butler.edu/wordways/vol22/iss1/14