Arabic Numerals ↔ Roman NumeralsToConvert,SupportsRange 1-3999
1. WithConsecutiveoutmostMany3Time:III=3,XXXX notUnion
2. SmallinBigLeftSide = -:IV = 5-1 = 4,IX = 10-1 = 9
3. SmallinBigRightSide = +:VI = 5+1 = 6,XII = 10+1+1 = 12
4. CommonCombination:IV(4) IX(9) XL(40) XC(90) CD(400) CM(900)