RMB: <<Can we use the 13 or 19 middos of derashah on the Megillah? These are to retreive intent of Anshei Keneses haGedolah, not deOraisos, so it's not exactly the same thing.>> See Tosefta Kesubos 4: 9-13, and see BM 104b, cf. Hasdei David on Tosefta Kesubos 4:10. David Riceman