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qza, спасибо :smiley:
Demonic_Duck, thank you very much for your exhaustive explanation :smiley:

Не знаю, поэтому и спросил :smiley:

Hello :smiley: My question is about greetings :roll:
As far as I know, "Hello", "Hi" are informal (familiar?) greetings; at this time "Good morning/afternoon/evening" are more official and...