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Hey all! I have a few questions regarding the format of submission: does it have to be created in the playgrounds app or can it be made in Xcode (using file new playground)? i see there are playground books and plain playgrounds. Are both acceptable? Or just one? About the Xcode creation, I tried and the playground created in Xcode seems to open correctly in the playgrounds app on Mac. Please let me know if I’m missing something, thanks!