I've been working on the top for a while... it is completely curved seams. Mr. Seam Ripper has been my constant companion. Hint: don't walk away to do another project without carefully checking the layout of the 4 colors. I had to completely unstitch 3 rows
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I found that this method of pinning works best for me... always with the 'smile' side up. The right corner is pinned vertically within the 1/4" seam allowance. The left corner is pinned horizontally within the 1/4" seam allowance keeping the pieces aligned for the first couple of stitches.
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