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In Russian in such situations we simply say: "х/з".[/quote]
Hmm... I doubt that. Х/з is a rude "expression" and doesn't actually mean the same as "je ne sais quois". If I were to need to translate...

In fact, "они разговаривают друг с другом" = "они говорят друг с другом". But if you need to delve deeply into nuances, I'd translate them this way:

они разговаривают друг с другом - they're...