,AAA,AA,A,BBB,BB,B,D
AAA,1.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000
AA,0.107091,0.678059,0.214072,0.000000,0.000000,0.000000,0.000778
A,0.000000,0.117393,0.841733,0.039169,0.000000,0.000000,0.001705
BBB,0.000000,0.000000,0.051019,0.901142,0.033963,0.000000,0.013876
BB,0.000000,0.000000,0.000000,0.081633,0.734694,0.142857,0.040816
B,0.000000,0.000000,0.000000,0.000000,0.125000,0.625000,0.250000
D,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,1.000000