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Now good.
Maybe better to explain this rule that way: than Russians pronounced "не ..." they may mixed up this with "ни ...", and than sense way be lost. Becouse of this, in sentences (or/and in...

Right word is "о чём".
Letter "ё" in Russian language always stressed! Its a rule.
In this case, than stress changed to another vowel letter in sentence, you have to change "ё" to "е".

В...