E
B
B
C
B
C
A
72 dB
C
C
B
C
A
B
A
C
A
B
B
A
72 dB
C
A
C
A
C
A
B
B
B
B
B
B
C
A
C
B
C
A
C
A
73 dB
C
A
C
A
C
A
73 dB