Ulla says that there 8 groups of treyfot that were told to Moses at Sinai - that is, the categories. Plus a focus on a punctured gallbladder, among other potential issues, where the animal may actually not die (but isn't that a miraculous event, and therefore not a proof for anything?). Also, a focus on some kind of injury for an animal that might or might not make the animal a treyfa -- with the example of a thorn in the animal's esophagus. And 4 cases that argue against Ulla's positions.