1672
But most of the vulnerabilities he found were in new code specifically written for Tizen within the last two years .
 ( discover vulnerability: found,  he: discoverer, most of the vulnerabilities: vulnerability, Tizen: vulnerable system, the last two years: time) 
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: found,  he: discoverer, most of the vulnerabilities: vulnerability, Tizen: vulnerable system, the last two years: time) 