This file is indexed.

/usr/share/calendar/calendar.all is in bsdmainutils 9.0.6ubuntu3.

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

The actual contents of the file can be viewed below.

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/*
 * International and national calendar files
 *
 * This is the calendar master file.  In the standard setup, it is
 * included by /etc/calendar/default, so you can make any system-wide
 * changes there and they will be kept when you upgrade.  If you want
 * to edit this file, copy it into /etc/calendar/calendar.all and
 * edit it there.
 *
 */

#ifndef _calendar_all_
#define _calendar_all_

#include <calendar.world>
#include <calendar.argentina>
#include <calendar.australia>
#include <calendar.belgium>
#include <calendar.birthday>
#include <calendar.christian>
#include <calendar.computer>
#include <calendar.croatian>
#include <calendar.debian>
#include <calendar.discordian>
#include <calendar.dutch>
#include <calendar.eu>
#include <calendar.freebsd>
#include <calendar.french>
#include <calendar.german>
#include <calendar.history>
#include <calendar.holiday>
#include <calendar.hungarian>
#include <calendar.judaic>
#include <calendar.kazakhstan>
#include <calendar.lotr>
#include <calendar.music>
#include <calendar.newzealand>
#include <calendar.pagan>
#include <calendar.russian>
#include <calendar.southafrica>
#include <calendar.thai>
#include <calendar.ubuntu>
#include <calendar.ukrainian>
#include <calendar.unitedkingdom>
#include <calendar.usholiday>

#endif /* !_calendar_all_ */