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For instance , in December 2014 , Yahoo 's security team knew the state - sponsored actor had stolen copies of backup files that contained users ' personal data .
 data breach: had stolen
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 data breach: had stolen