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A Confusing problem aboud F Magnets last night.

Revision en2, by yuyue, 2021-03-01 09:24:18

I came up an almost the same idea as the solution. The only difference is that I query &i&,&i&

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  Rev. Lang. By When Δ Comment
en6 English yuyue 2021-03-01 09:50:51 0 (published)
en5 English yuyue 2021-03-01 09:50:41 1
en4 English yuyue 2021-03-01 09:49:15 470
en3 English yuyue 2021-03-01 09:24:18 0
en2 English yuyue 2021-03-01 09:24:18 41
en1 English yuyue 2021-03-01 09:22:00 214 Initial revision (saved to drafts)