This file is indexed.

/usr/share/calendar/calendar.world is in bsdmainutils 8.2.3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/*
 * World wide calendar files, except national calendars
 *
 * $FreeBSD: src/usr.bin/calendar/calendars/calendar.world,v 1.5 2003/02/15 10:57:20 seanc Exp $
 */

#ifndef _calendar_world_
#define _calendar_world_

#include <calendar.birthday>
#include <calendar.christian>
#include <calendar.computer>
#include <calendar.history>
#include <calendar.lotr>
#include <calendar.holiday>
#include <calendar.judaic>
#include <calendar.music>
#include <calendar.pagan>
#include <calendar.discordian>
#include <calendar.debian>
#include <calendar.eu>
#include <calendar.ubuntu>

#endif /* !_calendar_world_ */