Consider a problem with four variables, {A, B, C, D}. Each variable has domain {1, 2, 3, 4}. The constraints on the problem are that A < B, B > C, A = D, C != D. Perform variable elimination to remove variable D.

What is in the pruned domain of variable A?

What is in the pruned domain of variable B?

What is in the pruned domain of variable C?

What is in the pruned domain of variable D?

List the elements of the projected relation. Please write the value of A, a comma, a space, then the value of C.

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