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Los Angeles Valley College in Valley Glen was subject to a cyber attack over the winter break but it is not known how large the breach was , officials said Tuesday .
 ( data breach: the breach,  over the winter break: time, Valley Glen: place, Los Angeles Valley College: victim) 
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:
 ( data breach: the breach,  over the winter break: time, Valley Glen: place, Los Angeles Valley College: victim) 