Merging Matrices

To clarify, the two matrices might look like this:

     A  B  C  D  E  F
A   1  2  3  4  5  6  
B   2  4  6  8  10 12
C   0  0  0  0  0  0  
D   0  1  0  1  0  1
E   3  6  9  11 13 15
F   2  2  2  2  2  2 

     B  D  E
B   4  9  13 
D   9  8  7
E   1  0  1

I would like this:

     A  B  C  D  E  F
A   1  2  3  4   5   6  
B   2  8  6  17 23 12
C   0  0  0  0  0  0  
D   0 10  0  9  7  1
E   3  7  9  11 14 15
F   2  2  2  2  2  2 

Thanks.

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