The following letter was written by Richard Lederer after a fight with his wife-to-be, Carol, when he was a student at Yale and she at Pembroke. Note that it contains no repeated words.
Lederer, Richard M.
"The Logologist's Love Letter,"
Word Ways: Vol. 16
, Article 9.
Available at: http://digitalcommons.butler.edu/wordways/vol16/iss1/9