1   # number of sigind blocks
10   # dimension of this sigind block
 1  7  0  0  0  0 0 0 0 0
 8  2  0  9  0  0 0 0 0 0
 0  0  3  0  0  0 0 0 0 0
 0  9  0  4  0  0 0 0 0 0
 0  0  0  0  5  0 0 0 0 0
 0  0  0  0  0  6 0 0 0 0
 0  0  0  0  0  0 0 0 0 0
 0  0  0  0  0  0 0 0 0 0
 0  0  0  0  0  0 0 0 0 0
 0  0  0  0  0  0 0 0 0 0