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Oct 8, 2020 at 16:41 comment added Yoyo Thx for your contribution.Have to think about it a bit more...
Oct 8, 2020 at 16:30 comment added WhatsUp @lambda Yes, not sure whether I'm missing something, as the OP claims that it's true for $N = 2$.
Oct 8, 2020 at 16:29 comment added lambda In fact, from the first four rows of your first counterexample we see that it's not true for $N = 2$ either.
Oct 8, 2020 at 16:24 history answered WhatsUp CC BY-SA 4.0