1. beta_brainwaves_focus_20Hz__betawaves_ _Betasounds_ _brainwaves_17116382973250558

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  2. beta_brainwaves_focus_8Hz__FocusWhilelearning_ _Focusing_ _brainwaves_17096273270807705

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  5. beta_brainwaves_focus_5Hz__studyfocus_ _Betasounds_ _brainwaves_17096492985135326

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  6. beta_brainwaves_focus_20Hz__brainwaves_ _betawaves_ _Betasounds_17114904505133123

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  7. beta_brainwaves_focus_20Hz__brainwaves_ _studyfocus_ _betawaves_17114921278094723

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  8. beta_brainwaves_focus_20Hz__Focusing_ _Betasounds_ _brainwaves_17116399568718412

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  9. beta_brainwaves_focus_20Hz__betawaves_ _FocusWhilelearning_ _studyfocus_17114602632879205

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  10. beta_brainwaves_focus_20Hz__focus_ _studyfocus_ _Betasounds_17114408529173188

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  11. beta_brainwaves_focus_20Hz__focus_ _brainwaves_ _betawaves_17116167841647131

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  12. beta_brainwaves_focus_20Hz__focus_ _brainwaves_ _Betasounds_1711488772076257

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  13. beta_brainwaves_focus_20Hz__focus_ _betawaves_ _studyfocus_17114708899625578

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  14. beta_brainwaves_focus_19Hz__Focusing_ _studyfocus_ _betawaves_17095373997330272

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  21. beta_brainwaves_focus_23Hz__Betasounds_ _studyfocus_ _focus_17096570584841683

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