An example of a valid code for a fictional female born on 13 October 1952 is codice_10. The control character, either a number or a letter, is calculated as the remainder of codice_11 divided by 31, i.e. by dropping the century sign and dividing the resulting nine-digit number by 31. Taking the number series, in this case .806451613 appearing "after" the decimal point and multiplying it by 31 and rounding the resulting number to the nearest whole number gives the remainder. The corresponding character is then picked from the string "0123456789ABCDEFHJKLMNPRSTUVWXY" (ambiguous letters G, I, O, Q, and Z are not used). For remainders below ten, the remainder itself is the control character whereas 10 corresponds to A, 11=B, 12=C, ending up with 30=Y. In this example, 131052308 / 31 = .806451613 x 31 = 25.000000003 rounded to 25=T.