The group of fifteen on perceiving an incomplete assembly as incomplete is finished. 30. The group of fifteen on being unsure “On the observance day, four or more resident monks may have gathered together in a certain monastery. there are other resident monks who haven’t arrived. They think, ‘Is it allowable for us to do the observance-day ceremony or not?’ Being unsure, they do the observance-day ceremony and recite the Monastic Code. While they’re doing it, a greater number of resident monks arrive. In such a case, those monks should recite the Monastic Code once more. There’s an offense of wrong conduct for the reciters. On the observance day, four or more resident monks may have gathered together in a certain monastery.