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/usr/share/xindy/base/page-ranges.xdy is in xindy-rules 2.4-1.1.

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The actual contents of the file can be viewed below.

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;; $Id: page-ranges.xdy,v 1.1 2004/05/24 21:53:27 jschrod Exp $
;;------------------------------------------------------------

;;;
;;; page ranges
;;;
;;; More than two consecutive pages are listed as a range.
;;;

(markup-range :sep "--")


;;======================================================================
;;
;; $Log: page-ranges.xdy,v $
;; Revision 1.1  2004/05/24 21:53:27  jschrod
;;     Standard modules, introduced in "LaTeX Companion Release".
;;