Scrabble rotating mechanisms and personalized graphics. An edition has been released (in association with the RNIB) with larger board and letters for players with impaired vision. The colours on the board are more contrasting and the font size is increased from 16 to 24 point. The tiles are in bold 48 point. An introduction to tournament "Scrabble" and its players can be found in the book "Word Freak" by Stefan Fatsis. In the process of writing, Fatsis himself progressed into a high-rated tournament player. The "Scrabble Player's Handbook", edited by Stewart Holden and written by an international group of tournament players,
Square-free word Square-free word In combinatorics, a square-free word is a word (a sequence of characters) that does not contain any subword twice in a row. Thus a square-free word is one that avoids the pattern "XX". Over a two-letter alphabet {"a, b"} the only square-free words are the empty word and "a", "b", "ab", "ba", "aba", and "bab". However, there exist infinite square-free words in any alphabet with three or more symbols, as proved by Axel Thue. One example of an infinite square-free word over an alphabet of size 3 is the word over the alphabet {0,±1} obtained by taking the