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/usr/share/xindy/lang/latin/letgroup.xdy is in xindy-rules 2.4-1.1.

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;; $Id: letgroup.xdy,v 1.3 1996/07/18 16:04:18 kehr Exp $
;;
;; This file contains the standard letter groups used in latin-based
;; languages.

(define-letter-groups
    ("a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m"
     "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"))

;; End