If you mean single Roman letters, they can either stand for numbers or abbreviations.If you mean single Roman letters, they can either stand for numbers or abbreviations.If you mean single Roman letters, they can either stand for numbers or abbreviations.If you mean single Roman letters, they can either stand for numbers or abbreviations.If you mean single Roman letters, they can either stand for numbers or abbreviations.If you mean single Roman letters, they can either stand for numbers or abbreviations.If you mean single Roman letters, they can either stand for numbers or abbreviations.If you mean single Roman letters, they can either stand for numbers or abbreviations.If you mean single Roman letters, they can either stand for numbers or abbreviations.
19
999
464
444
48
269
519
224
2
1776
1695