https://www.kk7rr.com/n-grams
├── [1.3M] 2-grams 20 18 WPM.mp3
├── [1.1M] 2-grams 25 20 WPM.mp3
├── [906K] 2-grams 30 25 WPM.mp3
├── [766K] 2-grams 35 30 WPM.mp3
├── [662K] 2-grams 40 35 WPM.mp3
├── [1.7M] 3-grams 20 18 WPM.mp3
├── [1.5M] 3-grams 25 20 WPM.mp3
├── [1.2M] 3-grams 30 25 WPM.mp3
├── [1.0M] 3-grams 35 30 WPM.mp3
├── [891K] 3-grams 40 35 WPM.mp3
└── [ 42K] distribution of characters and n-grams.pdf
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