D Họ: H2 20 Hz: µ<20 O Họ: Hs 20 Hz: µ>20 O Họ: H=20 H: H#20 O Hoi HAper- HBefore 20 Hii HAper Hefore<0 O Họ: HApper- Heefore S0 H: Hater- Hefore>0 O Họi HArer Hefore =0 Hi HAper- Hefore O Họ: Houring =HApter =HBefore

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