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A bloke has told how he discovered a bug in Valve 's Steam marketplace that could have been exploited by thieves to steal game license keys and play pirated titles .
 discover vulnerability: been exploited
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: been exploited