Defining and non-defining relative clauses

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We look after stray dogs. Their owners can't be traced.

We look after stray dogs whose owners can't be traced.

I live in a village called South Milton. It has a population of 600.

I live in a village called South Milton, which has a population of 600.

I run three times a week. It keeps me healthy.

I run three times a week, which keeps me healthy.

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