Four difficulties are raised against Rava's explanation of Rabbi Shimon—that he permits sanctified items to be potentially disqualified only after the fact, but not ab initio. Most of these challenges are resolved, though not all. In the fourth difficulty, the case of the leper's guilt offering is discussed. The Gemara then seeks to clarify how the log of oil is brought in the case of a leper when sacrifices have become intermingled.