The text of this book is mainly based upon unabridged Merriam-Webster dictionaries and less so on the Oxford English dictionary. Articles written in Word Ways magazine are also quoted. Eckler is the current editor of Word Ways. Definitions and lists of common and rare word plays are provided, e.g., lipograms, vowel language, text-determined obligatory or forbidden letters, tautonyms, word graphs, isograms, panograms, bigrams, ca dences, transpositions, word squares, letter-shifts, long words, et -- Source of annotation: Marvin or Ruth Sackner.