ok, i think i know what your saying.
but when the first diget goes above 10, the same problem occures!
minuteID MinuteCodeMinuteLastDigit
1---- 1,1---- 1
3---- 1,12---- 12
4---- 1,13---- 13
5---- 1,14---- 14
2---- 1,2---- 2
9---- 12,1---- 1
10---- 12,2---- 2
6---- 12,3---- 1...