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P1: 'Open file for reading' → with open('data.txt', '___') as f: [r]. P2: 'Write list to file, one item per line' → for item in my_list: f.write(___ + '\\n') [str(item)]. P3: 'Read all lines into a list' → lines = f.___() [readlines]. P4: 'Count lines in a file' → with open('file.txt') as f: count =

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