The Great Australian Spelling Bee (season 2) word correctly they win a point for their team. The first two teams to get three points are safe and these two teams will go into Spelling Bee. In Superword, spellers have to find words in a grid of nine letters revealed on the big screen. Words must contain five letters or more and include the centre letter. Spellers can use a letter only once and cannot name a word already given by another speller. Whenever a speller thinks they have identified a word they buzz in. Once identified correctly they must spell the word correctly to win a point.
Square-free word first difference of the Thue–Morse sequence. That is, from the Thue–Morse sequence one forms a new sequence in which each term is the difference of two consecutive terms of the Thue–Morse sequence. The resulting square-free word is Another example found by John Leech is defined recursively over the alphabet {"a, b, c"}. Let formula_1 be any word starting with the letter "a". Define the words formula_2 recursively as follows: the word formula_3 is obtained from formula_4 by replacing each "a" in formula_4 with , each "b" with , and each "c" with . It is possible to check that the