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          this is relating to a frequency below the audibility range of human ear or simply produced by infrasonic waves or vibration.

         relating to sound, sound waves, or the speed of sound.

         having a frequency above a human ear's audibility limit of about 20000 hertz- used of waves and vibrations

        relating to speeds from 1 to 5 times the speed of sound in air.
2 5 2
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