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However , after Yahoo disclosed the breach , a few months later , the company learned of an even bigger hack that involved 1 billion Yahoo user accounts and further rocked the company 's reputation .
 data breach: an even bigger hack
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: an even bigger hack