,AAA,AA,A,BBB,BB,B,D
AAA,0.833153,0.166667,0.000000,0.000000,0.000000,0.000000,0.000180
AA,0.000000,0.933083,0.066667,0.000000,0.000000,0.000000,0.000250
A,0.000000,0.061671,0.736238,0.117068,0.000000,0.083367,0.001657
BBB,0.000000,0.000000,0.061712,0.790523,0.061392,0.075733,0.010639
BB,0.000000,0.000000,0.000000,0.132042,0.780556,0.067587,0.019815
B,0.000000,0.000000,0.000000,0.023801,0.090450,0.697614,0.188136
D,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,1.000000