This exercise is based on four different inventory relation schemas: P, Q, R, and S. An instance of each relation schema is given below, each of which reflects a different design objective.

a. Identify the primary key of each relation schema.
b. Indicate the functional dependencies and/or multi-valued dependencies present in each design.
c. Evaluate each design for a fourth or fifth normal form violation. Explain your conclusion in each case.
d. Where there is a fourth normal form violation, provide a revised lossless-join design that is in fourth normal form.

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