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1. Review the ER diagram provided as a solution to HW1 and the SQL DDL provided as a solution to HW2- review them carefully! List any business rules called out in HW1's description that are not captured in this current SQL DDL. For each, indicate whether it is (i) reflected in the ER diagram but not in the SQL DDL or (ii) missing in both the ER diagram and the SQL DDL. An example answer in your list might be "The rule that a User must not be a cat is missing in both the ER diagram and the SQL DDL." (That is, if the initial problem statement had said that.)