Seven different symbols represent Roman numerals with specific values: I (1), V (5), X (10), L (50), C (100), D (500), M (1000). Roman numerals are formed by appending the conversions of decimal place values from highest to lowest. If an input value starts with 4 or 9, the subtractive form is used. Powers of 10 (I, X, C, M) can be appended consecutively at most 3 times.
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