Explain .json sheet of note song in Piano Tile 2 Game

I have .json in piano tile 2 game

Example : [url removed, login to view]

JSON : [url removed, login to view]

But i don't understand what structure inside json file, example: what is L? What is U? What is K ?

can you help me explain it? Thanks

Taidot: Android, JSON, Mobile App Development, Musiikki

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Projektin tunnus: #13067999

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Dear Prospect Hiring Manager. Thank you for giving me a chance to bid on your project. I am a serious bidder here and i have already worked on a similar project before and can deliver as u have mentioned I have c Lisää

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