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Democratic presidential nominee Hillary Clinton holds a masquerade mask as she jokes with members of her staff aboard her campaign plane in Erlanger, Kentucky. Photo Justin Sullivan/Getty Images
Revellers in costume pose for photos as they celebrate Halloween in Beijing
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Circus of Horrors performs its latest show The Night of the Zombie at the Wookey Hole Caves Theatre near Wells in Somerset, England
Participants dressed up as zombies march during a Halloween event in Tokyo, Japan.
Students dressed as zombies take part in an annual Halloween costume parade in Manila on Wednesday.