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LONDON, ENGLAND - JULY 13: (L-R) Barry Keoghan, Aneurin Barnard, Jack Lowden, James D'Arcy, Mark Rylance, Cillian Murphy, Fionn Whitehead, Harry Styles, Emma Thomas, Christopher Nolan, Tom Hardy and Kenneth Branagh attend the preview screening of 'Dunkirk' at BFI Southbank on July 13, 2017 in London, England. (Photo by Dave J Hogan/Dave J Hogan/Getty Images)

LONDON, ENGLAND - JULY 13:  (L-R) Barry Keoghan, Aneurin Barnard, Jack Lowden, James D'Arcy, Mark Rylance, Cillian Murphy, Fionn Whitehead, Harry Styles, Emma Thomas, Christopher Nolan, Tom Hardy and Kenneth Branagh attend the preview screening of 'Dunkirk' at BFI Southbank on July 13, 2017 in London, England.  (Photo by Dave J Hogan/Dave J Hogan/Getty Images)