The Gemoro (78a) asks why 2 "Oy" would be needed to include Kilaim and Nidme - we could just have one and learn Kal Vochomer from Kilaim to Nidme.
My question is that if we just had one Ribuy, we would allocate it for the least chidush, i.e. Nidme, and not know the inclusion of Kilaim; so this is not a good Hava Amina
Kol Tuv,
Meir Eliezer Bergman, Manchester, UK
Dear Meir,
The Rashba asks your question and answers that if the Torah says only Shor-Kesev without Ez, then the simple meaning would exclude Kilayim since it can't be born from Shor with Kesev (but Nidmeh can come from Shor or Kesev) so the first "O" is used to include Kilayim, which would have been excluded, even though it's a bigger Chidush than Nidmeh.
All the best,
Reuven Weiner