It corresponds to 'She is Mary's friend.' unmodified by another'. cf:

1. She is Mary's friend.

2. She is a friend of Mary's.

3. She is Mary's one friend.

4. She is one friend of Mary's.

Assume that 'of Mary's' is an adjunct. What is it adjoined to? What is the difference in meaning between the first and second phrases in each set above?

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