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Microsoft hit back at Google ’s approach to security patches last year , after discovering a Chrome flaw and “ responsibly ” disclosed it to Google so the company had enough time to patch .
 discover vulnerability: discovering
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:
 discover vulnerability: discovering