The following patristocrat-style cryptogram was sent to a guy named John. Therefore, it probably begins with "Dear John." You don't know anything more than that, except his romantic relationship has not been going well recently. Please try to recover the plaintext. The ciphertext has the letters grouped into sets of five, for ease of transmission.
A joint project of Prof. Seth Dutter and Prof. Gregory Bard of the University of Wisconsin---Stout, Department of Mathematics, Statistics, and Computer Science. (October 31, 2013)