,AAA,AA,A,BBB,BB,B,D
AAA,0.988755,0.010732,0.000000,0.000000,0.000000,0.000000,0.000513
AA,0.009172,0.985613,0.004488,0.000000,0.000000,0.000000,0.000727
A,0.000000,0.002856,0.986074,0.009322,0.000000,0.000000,0.001748
BBB,0.000000,0.000000,0.000000,0.977458,0.010647,0.000000,0.011896
BB,0.000000,0.000000,0.000000,0.018718,0.899084,0.057865,0.024333
B,0.000000,0.000000,0.000000,0.000000,0.000000,0.880364,0.119636
D,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,1.000000