,AAA,AA,A,BBB,BB,B,D
AAA,0.999393,0.000000,0.000000,0.000000,0.000000,0.000000,0.000607
AA,0.090793,0.817519,0.090793,0.000000,0.000000,0.000000,0.000895
A,0.000000,0.065087,0.911555,0.021696,0.000000,0.000000,0.001662
BBB,0.000000,0.000000,0.051241,0.871896,0.051241,0.012810,0.012810
BB,0.000000,0.000000,0.000000,0.075724,0.833355,0.030264,0.060657
B,0.000000,0.000000,0.000000,0.000000,0.181865,0.545423,0.272712
D,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,1.000000