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This is the quilt I made similar to the pattern you flagged. I can't find my pattern, but it was very easy. Basically, however many squares you sew across, you double that number for the squares down. This is necessary for the diagonal cuts.

The pattern suggests using a light weight stabilizer where you cut the diagonal lines because you will have a long bias seam. I think I cut a 2 inch wide strip of fusible stabilizer and ironed this to the diagonal of the quilt. Once the quilt is put back together, the diagonals are along the outside edges of the quilt. The finished quilt is a square. I wanted mine slightly larger so I used a thin inner boarder and a wider outer border.

Have fun and show us the finished quilt.