Defining and non-defining

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I wrote an application letter. I forgot to post it.

I wrote an application letter, which I forgot to post.

That girl over there used to be in my class. I don't remember her name.

That girl over there, whose name I don't remember, used to be in my class.

A friend of mine helped me get a job. His mother is a company director.

A friend of mine, whose mother is a company director, helped me get a job.

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