Two to Go allowing all but Anya to escape. Willow subdues Buffy, then disables Anya and negates her protection spells. As she declares her victory, she is struck down by a bolt of energy from the just-arrived Rupert Giles. Two to Go "Two to Go" is the 21st episode of season 6 of the television show "Buffy the Vampire Slayer". The name of the episode is a reference to the previous one, which ends with Willow saying "One down" after killing Warren. Despite the death of Tara Maclay, she remains in brief scenes that are part of the opening credits. This episode, and
Word (group theory) product of two words is obtained by concatenation: Even if the two words are reduced, the product may not be. The inverse of a word is obtained by inverting each generator, and switching the order of the elements: The product of a word with its inverse can be reduced to the empty word: You can move a generator from the beginning to the end of a word by conjugation: Given a presentation formula_19 for a group "G", the word problem is the algorithmic problem of deciding, given as input two words in "S", whether they represent the same element of