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In a letter to employees Thursday evening , CPS Chief Operating Officer Arnie Rivera said the district learned of the massive data breach Wednesday , the day after the information was stolen .
 data breach: data breach
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: data breach