One rule of Roman numerals is you cannot have more than 3 of the same letter in a row.
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For rules relating to the use of Roman numerals see related links.
Under today's rules they represent 692 in Roman numerals.
As Roman numerals they are invalid because they do not conform with the rules governing the Roman numeral system.
Under today's rules the Roman numerals CMXLVII represent 947.
to follow roman numerals is sereos in working