Viewing the file with whitespace visible in vim shows that there are strange combinations of tabs and spaces at the end of each line.
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Assuming there’s more to whitespace than meets the eye, we search for all non-whitespace characters:
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…and remove them. We also delete every other line, which contains nothing more than a single tab.
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Converting each space to a zero and each tab to a one reveals:
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Now we just view the data as ASCII!
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Flag: WhitespaceProgrammingIsHard