C
A
C
B
C
B
C
A
D
C
72 dB
C
A
D
C
72 dB
C
B
72 dB
C
A
C
A
C
B
C
B
72 dB
C
B
C
A
C
A
C
B
C
B
C
A
D
C
72 dB
C
B
C
B
C
B
73 dB
D
C
72 dB
C
B
