>>836
http://info.2ch.net/wiki/index.php?%A4%CA%A4%F3%A4%AB%B5%AC%C0%A9%A4%B5%A4%EC%A4%C6%A4%A4%A4%EB%A4%DF%A4%BF%A4%A4%A4%CA%A4%F3%A4%C7%A4%B9%A4%AC%A1%C4#Continuous_Contribution_Restriction