Dear Andrew, 

Thank you for an excellent tool. I am just wetting my feet with it and have come into an unexpected problem. 

NBS does not seem to be recognising my exchange blocks file, or the typed exchange block input: 
[1
2
3
4
5
6
2
4
7
5
4
8
7
5]

Any idea what I'm doing wrong here?

Also, while I have your attention, would you mind me asking you if the two following designs are equivalent (difference in first column/2 columns):
design1:
0 0 1 0 0 0 0 0 0 0
0 0 0 1 0 0 0 0 0 0
0 0 0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 1 0 0 0
0 0 0 0 0 0 0 1 0 0
1 0 0 1 0 0 0 0 0 0
1 0 0 0 0 1 0 0 0 0
1 0 0 0 0 0 0 0 1 0
1 0 0 0 0 0 1 0 0 0
0 1 0 0 0 1 0 0 0 0
0 1 0 0 0 0 0 0 0 1
0 1 0 0 0 0 0 0 1 0
0 1 0 0 0 0 1 0 0 0

contrast1:
[-1 1 0 0 0 0 0 0 0 0]

design2:
0 1 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0
0 0 0 1 0 0 0 0 0
0 0 0 0 1 0 0 0 0
0 0 0 0 0 1 0 0 0
0 0 0 0 0 0 1 0 0
-1 0 1 0 0 0 0 0 0
-1 0 0 0 1 0 0 0 0
-1 0 0 0 0 0 0 1 0
-1 0 0 0 0 1 0 0 0
1 0 0 0 1 0 0 0 0
1 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1 0
1 0 0 0 0 1 0 0 0

contrast2:
[1 0 0 0 0 0 0 0 0]

Thanks a lot,

Sean