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a) Why is it not possible for a graph to have degree sequence 6, 6, 5,...

a) Why is it not possible for a graph to have degree sequence 6, 6, 5, 5, 4, 4, 4, 4, 3?
b) Why is it not possible for a graph to have degree sequence 8, 8, 7, 6, 5, 4, 3, 2, 1?

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