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Returns True if some multigraph can realize the sequence.
deg_sequence : list
A list of integers
valid : bool
True if deg_sequence is a multigraphic degree sequence and False if not.
The worst-case run time is O(n) where n is the length of the sequence.
[R242] S. L. Hakimi. “On the realizability of a set of integers as degrees of the vertices of a linear graph”, J. SIAM, 10, pp. 496-506 (1962).