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A man holds a sign that reads ‘Stop Boko Haram’ at a rally to support Chadian troops heading to Cameroon to fight Boko Haram, in Ndjamena January 17, 2015 (Credit: Reuters/Emmanuel Braun)

A man holds a sign that reads 'Stop Boko Haram' at a rally to support Chadian troops heading to Cameroon to fight Boko Haram, in Ndjamena January 17, 2015 (Credit: Reuters/Emmanuel Braun)