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By Andrew R.C. Marshall and Manuel Mogato DAVAO, Philippines (Reuters) - On May 14, five days after voters in the Philippines chose Davao City Mayor Rodrigo Duterte as their next president, two masked gunmen cruised this southern city's suburbs on a motorbike, looking for their kill. Gil Gabrillo, 47, a drug user, was returning from a cockfight when the gunmen approached. The murder made no headlines in Davao, where Duterte's loud approval for hundreds of execution-style killings of drug users and criminals over nearly two decades helped propel him to the highest office of a crime-weary land.