Scrabble Showdown set of 16 letter tiles are placed on the board. A randomizer then causes tiles to light up. Each team is allowed to stop the randomizer; a team starts the final round with the regulation value of the tiles that they stop the randomizer on; the number of tiles that the randomizer lights up is the number of "Bonus Scrabble Tiles" that the team had earned from the three previous rounds. This becomes their "head start" score before playing "Scrabble Lightning". The game is played on a regulation Scrabble board with only the double and triple-word score spaces (the double
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