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Hello Reldresal, the hidden sort markers were placed on the list of terrorist incident pages as a result of discussions during the period Aug-Oct 2017 (see talk pages for list of terrorist incidents for those months). Each incident used to have a flag icon, which were then removed following this discussion. As a result, some editors then wished to be able to sort the table by country, so the hidden sort templates were added to enable this. This work does not appear to have been continued as additional incidents and months were added. Loopy30 (talk) 04:23, 27 January 2018 (UTC)[reply]