Let


 A=[  1  7 14 19 28 33 40 46 50 ]
 B=[  2 13 25 38 52 12 20 32 45 ]
 C=[ 39  6  8 26 24 51 11 34 37 ]


and


       |   A  B  C -A -B -C  |
   D = |   C -A -B -C  A  B  |
       |   B  C -A -B -C  A  |
       |  -A -B -C  A  B  C  |
       |  -C  A  B  C -A -B  |
       |  -B -C  A  B  C -A  |


Append a row and a column of zeroes to D to obtain a (55,7,1)
difference matrix.