,AAA,AA,A,BBB,BB,B,CCC,D
AAA,1.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000
AA,0.027787,0.972213,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000
A,0.000000,0.153888,0.846112,0.000000,0.000000,0.000000,0.000000,0.000000
BBB,0.000000,0.000000,0.151344,0.830587,0.000000,0.000000,0.002996,0.015073
BB,0.000000,0.000000,0.000000,0.083300,0.750000,0.150030,0.016670,0.000000
B,0.000000,0.000000,0.000000,0.000000,0.039961,0.816033,0.144006,0.000000
CCC,0.000000,0.000000,0.001000,0.002000,0.003000,0.031969,0.962031,0.000000
D,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,1.000000