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Notwithstanding todays modern conversion of 999 into Roman numerals which is now considered to be CMXCIX inasmuch that the ancient Romans would have probably added together the equivalent of 777 and 999 in either of the following formats:-

Abridged format:

DCCLXXVII+IM = MDCCLXXVI => 777+(1000-1) = 1776

Elongated format:

DCCLXXVII+DCCCCLXXXXVIIII = MDCCLXXVI => 777+999 = 1776

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