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HANOVER, GERMANY - JULY 15: Young players walk through the city centre of Hanover while holding their smartphones and playing 'Pokemon Go' on July 15, 2016 in Hanover, Germany. 1.200 players have participated in the night walk through the city centre until midnight. 'Pokemon Go' is a mobile game for smartphones, it uses advanced reality and geo-data to integrate the player in his search for new monsters or opponents within his location. The player now has to walk through the city, instead of spending time in front of a computer. (Photo by Alexander Koerner/Getty Images)

HANOVER, GERMANY - JULY 15: Young players walk through the city centre of Hanover while holding their smartphones and playing 'Pokemon Go' on July 15, 2016 in Hanover, Germany. 1.200 players have participated in the night walk through the city centre until midnight. 'Pokemon Go' is a mobile game for smartphones, it uses advanced reality and geo-data to integrate the player in his search for new monsters or opponents within his location. The player now has to walk through the city, instead of spending time in front of a computer.  (Photo by Alexander Koerner/Getty Images)