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In page The Economist:

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Letters published in the paper are typically between 150 and 200 words long and had the now-discontinued salutation 'Sir' from 1843 to 2015. In the latter year, upon the appointment of Zanny Minton Beddoes, the first female editor, the salutation was dismissed; letters have since had no salutation.[citation needed] Prior to a change in procedure, all responses to online articles were published in "The Inbox".[citation needed]