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Nearly three weeks after many of its systems were knocked out by a complex ransomware virus , Alaska ’s Matanuska - Susitna Borough has restored most of its phone system , part of its geospatial information system and the online portal on which residents can pay their looming property - tax bills .
 ransom: were knocked out
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:
 ransom: were knocked out