The solution to the problem is as follows:
dimension = 3 -----------------------> only 3 data are necessary (and sufficient)
D21-12 = ( (0,1,0), (-1,0,0) , (0,0,0) )
D31-13 = ( (0,0,1), (0,0,0), (-1,0,0) )
D32-23 = ( (0,0,0), (0,0,1), (0,-1,0) )
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