Sorry, I missed the overlapping portion of the pattern.
This one goes as follows:
First round: A1=x1, b1=x2, a2=x3, B2=x4
Second Round: a2=x1, B2=x2, a3=x3, b3=x4
Oh, and I'm using Excell conventions, so A=column1, 1=Row1, B=column2, 2=Row2
Cheers,
J5
2006 Ultimate LabVIEW G-eek.