A number of words become new words when, contemporaneously, the front letter is looped to the back and the back to the front. The first and last letters must be different, of course, and the result of this double loop is that the first and last letters are exchanged. If the middle letters are palindromic, the pair becomes palindromic.
Lederer, Richard and Storer, Norm
Word Ways: Vol. 42
, Article 2.
Available at: http://digitalcommons.butler.edu/wordways/vol42/iss3/2