A:=[[ 5, 2, 6, 4,-3,-1,-7],
    [-5, 2,-1, 4,-7, 3, 6],
    [-7, 5, 1, 6,-2, 4,-3], 
    [ 2,-4,-7, 5, 1, 3,-6], 
    [ 6, 7, 1,-4, 2,-5, 3], 
    [-1, 4, 5,-2,-7, 3, 6], 
    [ 1,-3, 4, 2, 5, 6,-7], 
    [-1, 3,-6, 2, 5, 7, 4]]:


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