XIIXXXIXCVIII

XIIXXXIXCVIII is a string of Roman numerals. In this representation, 'X' is used to denote the number 10, 'I' is used for 1, and 'V' for 5, and 'C' for 100. When a numeral of lesser value precedes a numeral of greater value, it is subtracted. For example, IX is 9 (10-1). When a numeral of lesser or equal value follows a numeral of greater value, it is added. For example, XI is 11 (10+1). The string can be broken down as follows: XII (12) XXX (30) IX (9) CVIII (108). Combining these parts: 12 + 30 + 9 + 108 equals 159. Therefore, XIIXXXIXCVIII is equivalent to the Arabic numeral 159. The repetition of 'X' within the string, specifically 'XXX', is a valid way to represent 30. Similarly, 'CVIII' correctly represents 108 with 'C' for 100, 'V' for 5, and 'III' for 3. The placement of 'IX' also adheres to the subtractive principle of Roman numerals.