| NS 8099 with K on side because of Southerns Jerry Durands system that put letters at end of numbers so they prevented transposition of digits in the computer system. For 8099 you add 8+0+9=17, then double the last 9 for 18. then add them to get 9 and sum up everything else to 26. The break point is 30 so difference of four which K is number 4. |