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Aug 4, 2020 at 16:40 vote accept Min Wu
Jul 29, 2020 at 14:26 answer added Min Wu timeline score: 5
Jul 29, 2020 at 13:45 comment added Min Wu I think you are right. LOL Thanks for pointing out. This saves me a lot of time.
Jul 29, 2020 at 9:01 comment added j.p. The preimage of $Q_{\le 3}$ should contain everything NOT mapped to $6$. Aren't you missing $7$ and $8$? (same for $6$ instead of $3$)
Jul 29, 2020 at 4:46 history asked Min Wu CC BY-SA 4.0