Large explosion near police headquarters in centre of capital

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What does the phrase 'Not at all' imply in a conversation?

In what contexts might someone use the expression 'Not at all'?

How can the phrase 'Not at all' affect the tone of a conversation?

What are some alternative phrases that convey a similar meaning to 'Not at all'?

Can 'Not at all' be used in both formal and informal settings? Explain your reasoning.