Koch 47 KMRSUAPTLOWI.NJEF0YVGS/Q9ZH38B?427C1D6X=,*+-_$! - 1140 N 25WPM 800Hz 90%

Practice hear characters 'KMRSUAPTLOWI.NJEF0YVGS/Q9ZH38B?427C1D6X=,*+-_$!' use Koch method (after can hear charaters correct 90%, add 1 new character), 1140 word random length, 25 word/minute, 800 Hz, 90% volume.

Use .mp3 file format because .WAV very big and no need great sound quality.

Code:
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