The Mishna says its possible to be punished with many malkos for one act of plowing...I have two problems with this

1. What happened to the shas wide rule of "Ein Issur chal al Issur" . I checked the Rambam, whio seems to touch on this problem, in Pirush Hamishna...not sure what he means. I also noticed the Yuchim U'boaz deals with this at length....is there any simple answer. This is something the Gemora should address, but amazingly ignores it.

2. We learned in the first Perek that only Rav Meir allows for multiple malkos. The Rabbana apply the rule of "Keday Rishosow" that one can only recieve one punishment.... otherise known as Kum Leh Bderaba meneh. Is this Mishnah following the opinion of Rav Meir ?

Tzvi Wainhaus, chicago