B C 71 dB

C A 69 dB

C A 71 dB

B A 72 dB

B B 71 dB

C A 72 dB

A A 69 dB

C B 71 dB

A B 71 dB

C A 71 dB

D A 72 dB

C B 69 dB

C A 68 dB

D A 72 dB

D A 71 dB

C A 69 dB

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