How is this speedrun possible? Super Mario Bros. World Record Explained

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Watch the sequel about 4;55: https://www.youtube.com/watch?v=4CgC2g43smA
Watch the unedited run here: https://youtu.be/QJR7fasYlDw
Current WR by Kosmic: https://www.youtube.com/watch?v=1wR8x5b_ExM
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