,AAA,AA,A,BBB,BB,B,D
AAA,1.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000
AA,0.000000,0.444444,0.444444,0.111111,0.000000,0.000000,0.000000
A,0.000000,0.000000,0.635247,0.362982,0.000000,0.000000,0.001771
BBB,0.000000,0.000000,0.052123,0.781841,0.104245,0.052123,0.009668
BB,0.000000,0.000000,0.000000,0.107188,0.464290,0.285682,0.142841
B,0.000000,0.000000,0.000000,0.000000,0.000000,0.500000,0.500000
D,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,1.000000