Quickly review the גמרא דף כב. “ר’ יהודה אומר until “אמר רבי שמעון בן אלעזר (two lines before the wide lines)
What is the explanation of אריך וקטן?
See רש”י
See ריטב”א for different explanation
Continue the Gemara until the Mishna
What are these new rules?