Turn four of these strips so that the first block on the left is a plain square.  These are strips 1,3,5 and 7. 

The remaining 4 strips have a nine-patch square as first block in the strip.  We'll number these 2,4,6 and 8. 

Be sure to press the seams so that they will nestle together properly. One row should all be pressed to the right.  The row next to it should be pressed to the left. 

Pin Strip 1 to Strip 2, right sides together.  Take extra care at the intersections of four blocks, lining up the seams and pinning as needed.  Now, sew!

Press the seam to one side.  Pin Strip 2 to Strip 3, and repeat for remaining odd and even strips: 3 to 4,  4 to 5, and so on.