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    One of the following one- or two-letter codes:

    Code     Form of Sequence and Case

    D        Decimal numbers
    O        Octal numbers
    H        Hexadecimal numbers
    RU       Roman uppercase numerals
    RL       Roman lowercase numerals
    RM       Roman mixed case numerals - only first numeral is
             uppercase
    LU       Letters, uppercase
    LL       Letters, lowercase
    LM       Letters, mixed case - only first letter is uppercase