Precedent and unprecedented

[Imsriram]

I am quite confused with the words "precedent" and "unprecedented".

Could you please help me with some sentences?

Thanks in advance.
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I like this very much :-)

[Mister Micawber]

I have a better idea, Imsriram: Why don't you google the two words and then post some sample sentences that you like here? Then we will check for you that they are typical uses of the words.
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Native English teacher at Mister Micawber's