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May 1, 2021 at 16:10 comment added LSpice @nfdc23's answer referenced in the comments.
May 1, 2021 at 16:10 comment added LSpice @PaulLevy's answer referenced in the post.
May 20, 2017 at 14:39 comment added nfdc23 One can arrange the case-work to require closer inspection only for type ${\rm{B}}_2={\rm{C}}_2$; please see the answer I have posted.
May 20, 2017 at 13:16 history answered Jim Humphreys CC BY-SA 3.0