9108
This occurred in 1880 , when Lee Richmond and John Montgomery Ward pitched perfect games within five days of each other , although under somewhat different rules : the front edge of the pitcher 's box was only from home base ( the modern release point is about farther away ) ; walks required eight balls ; and pitchers were obliged to throw side-armed .
 Lee Richmond, John Montgomery Ward
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lee Richmond, John Montgomery Ward