Question:What are the E.F. Codd's normal forms? 

Answer Following are the Codd's normal forms:
- First Normal Form: Eliminate repeating groups of attributes in an entity.
- Second Normal Form: Eliminate partial key dependencies, i.e. each attribute in an entity must depend on the whole key, not just a part of it.
- Third Normal Form: Eliminate redundant information by eliminating interdepencies between non-key attributes. 

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