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The shell stitch is that beautiful fan-like stitch that is often used to trim blankets, baby items, and even the edging of sweaters. It's usually done in multiples of 4 stitches: 1 single crochet, skip a stitch, 5 double crochet stitches into next stitch, skip 1 stitch, 1 sc in next st. Keep repeating this pattern around the edge of your item.
Alternatively, skip 2 stitches on each side of a shell stitch if you just want shells and no single crochet stitches in between.
Experiment with how many stitches to skip in between shells so that your work will lay flat when done.