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Let $G$ be a non-abelian group. Assume that for every two non-central elements $x$ and $y$ there is a non-central element $w \in C_G(x) ‎‎\cap‎ C_G(y)$. Then what can we say about $G$?

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Do you ask this because of your interest in the commuting graphs of groups? There seems to be no (finite?) group known to have this property - see the last sentence here. –  Someone Apr 5 '13 at 13:41
@Someone: One of the comments on that same blog post mentions that there is a group of order 32 whose commuting graph has diameter 2. –  S. Carnahan Apr 5 '13 at 14:40
@S. Carnahan: Oh, right. Thanks. Even the very first comment corrects already the statement that no such groups are known. It seems worth to read the comments sometimes... –  Someone Apr 5 '13 at 15:28

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