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