I don't sew blocks into rows then sew the rows together. It works better for me to sew the blocks into sets of two across. Then flip the top set of two down over the next set of two. The next step is to flip the set of 4 to the right and stitch to the set of 4. Usually there is only one long row to stitch then. Don't know if that makes sense to anyone. I just don't like stitching and matching long rows of blocks.