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We define three types of bytes:
alphabet: english alphabets [a-zA-Z]
international: international characters [-ÿ]
marker: everything else [^a-zA-Z-ÿ]
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are replaced by a single space ascii character.
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Returns a copy of ``buf`` that retains only the sequences of English
alphabet and high byte characters that are not between <> characters.
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before occurrences of >.
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characters and extended ASCII characters, but is currently only used by
``Latin1Prober``.
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