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FILE - In this Saturday, May 19, 2018 file photo, PSG head coach Unai Emery claps, during the League One soccer match between Caen and Paris Saint-Germain at the Michel d'Ornano stadium in Caen, western France. The last time Arsenal unveiled a new manager, social media didn’t exist. On Wednesday, May 23, 2018 the north London club announced the appointment of Unai Emery on Twitter. (AP Photo/David Vincent, File)

FILE - In this Saturday, May 19, 2018 file photo, PSG head coach Unai Emery claps, during the League One soccer match between Caen and Paris Saint-Germain at the Michel d'Ornano stadium in Caen, western France. The last time Arsenal unveiled a new manager, social media didn’t exist. On Wednesday, May 23, 2018 the north London club announced the appointment of Unai Emery on Twitter. (AP Photo/David Vincent, File)

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