Take the surnames of the US presidents. For each one, what is the longest transdeletion and what is the shortest transaddition? Jim Puder posed and answered these problems in the August 1998 Word Ways. The November 1998 Colloquy contained a healthy response to Puder's article, improving on several of the words offered.
"Transdeleted and Transadded Presidents,"
Word Ways: Vol. 37
, Article 9.
Available at: http://digitalcommons.butler.edu/wordways/vol37/iss1/9