I can write the code to do the sorting and sequential check you described in VB6, you can easily adapt it to Excel. Is the data private? If not, do you have a flat text file that has all of the data in it? Or do you have it in a spreadsheet such that you cold save it to a csv file and send it to me? If so I will write up a quick program and send you the program and the source code so you can see how I did it.

Mike