Enigma 113: What is the code word?
5 August 2013
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From New Scientist #1257, 11th June 1981 [link]
A code word consists of five letters, each letter being either X, Y or Z. Determine the code word with the following clues:
(1) The word X X Y Y Y contains three letters of the code word, but has only one letter in the correct location.
(2) The word Z Z X X X contains four letters of the code word and has only one letter in the correct location.
(3) The interchange of the letters Z and X in the second and third locations in the word of clue 2 does not change the number of letters in the correct locations.