youtube-dl https://www.youtube.com/
youtube-dl -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/mp4' https://www.youtube.com/
youtube-dl -F https://www.youtube.com/
youtube-dl -f 18 https://www.youtube.com/
youtube-dl -x --audio-format mp3 https://www.youtube.com/
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