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The puff stitch is similar to the bobble stitch but done with the half double crochet stitch. To make a 3-hdc puff stitch, yarn over, insert hook into the stitch and pull up a loop (3 loops on hook at this point), yarn over, insert hook into same stitch, and pull up a loop (5 loops on hook), yarn over, insert hook in same stitch, and pull up a loop (7 loops on the hook). Yarn over and pull through all loops on the hook. You might want to work on extra chain stitch to close the puff stitch firmly.