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int decimalNumber = index + 1;

int[] values = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
String[] romanLetters = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};

StringBuilder romanNumber = new StringBuilder();

for(int i = 0; i<valuesi < values.length; i++){  
    while(decimalNumber >= values[i]){
        decimalNumber = decimalNumber - values[i];
        romanNumber.append(romanLetters[i]);
    }
}

return romanNumber;