Two to Go him - only to learn that it was only the "first" stage. Dawn and Clem decide to go to the dark magician Rack's lair, expecting Willow to try to deal with him to recharge her powers. Buffy, Xander and Anya regroup at the Magic Box and debate their course of action. Buffy believes she can convince Willow to relent, but the others disagree; Buffy heads for Rack's, alone. Xander admits to Anya that he might have been able to stop Warren before he fired on Buffy and Tara, but was afraid to intervene, unarmed. Willow meets with Rack, who attempts
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