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vxMatMulM1TbyM2()

Multiply the transpose of the matrix Mat_1 by
the matrix Mat_2. The number of rows in Mat_1 must be equal to the
number of rows in Mat_2. Populates the vector *Product*, with
the result of the multiplication, as:

*P[n][j] = M1 *^{T}[m][n] *
M2[m][j]

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