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This twisted tale starts in July 2016 , when security researcher Ryan Hanson discovered a flaw in RTF files that he could exploit to execute code on the underlying operating system .
 discover vulnerability: discovered
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: discovered