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(a) Where any document submitted by the applicant contains an indication of a file reference, that reference shall not exceed 12 characters in length and may be composed of either letters of the Latin alphabet or Arabic numerals, or both.
(b) Correspondence from International Authorities intended for the applicant shall indicate any such file reference.
Any date in the international application, or used in any correspondence emanating from International Authorities relating to the international application, shall be indicated by the Arabic number of the day, by the name of the month, and by the Arabic number of the year. The receiving Office, where the applicant has not done so, or the International Bureau, where the applicant has not done so and the receiving Office fails to do so, shall, after, above, or below any date indicated by the applicant in the request, repeat the date, in parentheses, by indicating it by two-digit Arabic numerals each for the number of the day, for the number of the month and for the last two numbers of the year, in that order and with a period, slant or hyphen after the digit pairs of the day and of the month (for example, "20 March 2001 (20.03.01)," "20 March 2001 (20/03/01)," or "20 March 2001 (20-03-01)").
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