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Experts at the University Alliance Ruhr recently announced vulnerabilities in laser printers from manufacturers including Dell , HP , Lexmark , Samsung , Brother , and Konica .
 ( discover vulnerability: recently announced,  Experts: discoverer, vulnerabilities: vulnerability, laser printers: vulnerable system, manufacturers: vulnerable system owner, Dell: vulnerable system owner, HP: vulnerable system owner, Lexmark: vulnerable system owner, Samsung: vulnerable system owner, Brother: vulnerable system owner, Konica: vulnerable system owner, the University Alliance Ruhr: discoverer) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( discover vulnerability: recently announced,  Experts: discoverer, vulnerabilities: vulnerability, laser printers: vulnerable system, manufacturers: vulnerable system owner, Dell: vulnerable system owner, HP: vulnerable system owner, Lexmark: vulnerable system owner, Samsung: vulnerable system owner, Brother: vulnerable system owner, Konica: vulnerable system owner, the University Alliance Ruhr: discoverer) 