Find the matrix product of two 2D arrays.

For example, given

import numpy as np
A = np.array([
    [9, 8],
    [7, 6],
    [5, 4],
    [3, 2],
])
B = np.array([
    [1, 2, 3],
    [4, 5, 6]
])

Find

[[41 58 75]
 [31 44 57]
 [21 30 39]
 [11 16 21]]

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