,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,0.000000,0.977474,0.022526,0.000000,0.000000,0.000000,0.000000,0.000000
A,0.000000,0.019239,0.980761,0.000000,0.000000,0.000000,0.000000,0.000000
BBB,0.000000,0.000000,0.083249,0.913756,0.000000,0.000000,0.002996,0.000000
BB,0.000000,0.000000,0.000000,0.000000,0.812465,0.140634,0.015626,0.031275
B,0.000000,0.000000,0.000000,0.000000,0.000000,0.800028,0.141181,0.058791
CCC,0.000000,0.000000,0.001000,0.002000,0.003000,0.020000,0.863484,0.110516
D,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,1.000000