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