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As the first known " dice pool " system it had an influence on other role-playing games , too : after producing " Ars Magica " , Jonathan Tweet and Mark Rein-Hagen were inspired by " Ghostbusters " to each design their own game based on " dice pool " resolution mechanics .
 person: Jonathan Tweet; person: Mark Rein-Hagen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Jonathan Tweet; person: Mark Rein-Hagen