540
Microsoft and Google have been bitter rivals for at least a decade , and the pair have had several disagreements over security vulnerability disclosure in recent years .
 recent years: time; Microsoft: vulnerable system owner; Google: vulnerable system owner; the pair: vulnerable system owner
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 recent years: time; Microsoft: vulnerable system owner; Google: vulnerable system owner; the pair: vulnerable system owner