,AAA,AA,A,BBB,BB,B,D
AAA,0.500000,0.500000,0.000000,0.000000,0.000000,0.000000,0.000000
AA,0.000000,0.800000,0.200000,0.000000,0.000000,0.000000,0.000000
A,0.000000,0.078330,0.704756,0.136998,0.000000,0.078330,0.001587
BBB,0.000000,0.000000,0.039593,0.844461,0.039593,0.065951,0.010402
BB,0.000000,0.000000,0.000000,0.173092,0.720955,0.086485,0.019468
B,0.000000,0.000000,0.000000,0.071403,0.071403,0.642866,0.214329
D,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,1.000000