1890
They thanked Tavis and others like him for reporting these sort of problems and helping them make online security even better for the rest of their users .
 others like him: discoverer; Tavis: discoverer; these sort of problems: vulnerability
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:
 others like him: discoverer; Tavis: discoverer; these sort of problems: vulnerability