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The double treble crochet stitch (dtr) is the longest stitch of the crochet world. It gets its name from the fact that you will wrap yarn around your hook the same number of times as though you were making a double (1 time) and a treble (2 times) stitch. So, wrap yarn around your hook 3 times before inserting it into the next stitch. Yarn over and pull yarn through 2 of the loops on your hook (there should have been a total of 5 loops on your hook -- the loop from the previous stitch, the 3 loops created in the yarn overs, and the loop you had just pulled through). Yarn over and pull yarn through the next 2 loops on your hook, and repeat this again 2 more times, for a total of yarn over and work off 2 loops 4 times.