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Normalize the database schema into the third normal form. You may skip the second normal form and get to the third normal form directly. Briefly

Normalize the database schema into the third normal form. You may skip the second normal form and get to the third normal form directly. Briefly reason why your normalized schema is in 3rd normal form.

You may add primary keys in decomposed schemas.

The original schema:

Student_id | Date_of_birth | Address | Course_1 | Course_2 | Course_3 | Course_1_instructor | Course_2_instructor | Course_3_instructor | Course_1_grade | Course_2_grade | Course_3_grade | Course_1_semester | Course_2_semester | Course_3_semester

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