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Roman Numeral Rules

• • I=1, V=5, X=10, L=50, C=100, D=500, M=1000
• • A smaller numeral before a larger = subtraction (IV=4, IX=9, XL=40, XC=90, CD=400, CM=900)
• • Max 3 of same numeral in a row (III=3, but IIII is invalid)
• • Valid range: 1–3999 (MMMCMXCIX)