{{1, 2, 3, 4}, {5, 6, 7, 8}} . {{9, 10}, {11, 12}, {13, 14}, {15, 16}}{{1, 2, 3, 4}, {5, 6, 7, 8}} . {{9, 10}, {11, 12}, {13, 14}, {15, 16}}

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