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a/src/internfile/mh_mail.h b/src/internfile/mh_mail.h
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        return true;
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        return true;
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    return false;
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    return false;
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    }
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    }
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    virtual bool next_document();
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    virtual bool next_document();
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    virtual bool skip_to_document(const std::string& ipath);
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    virtual bool skip_to_document(const std::string& ipath);
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    virtual void clear();
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    virtual void clear_impl() override;
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protected:
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protected:
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    virtual bool set_document_file_impl(const std::string& mt,
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    virtual bool set_document_file_impl(const std::string& mt,
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                                        const std::string& file_path);
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                                        const std::string& file_path);
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    virtual bool set_document_string_impl(const std::string& mt,
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    virtual bool set_document_string_impl(const std::string& mt,