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    Hex command  (Hexarithmetic)

    Purpose:  Adds the two hexadecimal values, then subtracts the second
              from the first.

              Displays the sum and difference on one line.

    Format:   H value value

    Example:  H 0F 8
              17 07

              The hexadecimal sum of 000Fh and 0008h is 0017h, and their
              difference is 0007h.