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To start with, take your row of stitches (practice on a swatch first I think)

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Knit the first one as you normally would when casting off

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Now, insert the left needle in the back of the stitch you just knitted, you should have this sort of thing...

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Now, take the tip of the right needle and insert it in the next stitch, as if to knit,

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you should see a lovely cross formed with the stitches and the needle through both of them and out the back, like this
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Now, just pass the yarn round the needle as usual for a knit stitch

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Pull the point of the needle back through your cross, you should have a lovely stitch on your needle

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Now pull that off the left needle, and start again

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Put the left needle through the back of the stitch on the right

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Right needle through next stitch to knit

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Knit

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Off

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Keep going, it should look like this

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and eventually, you have this

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Here are a couple of examples of this stitch in real live action.....
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The collar of the Drops Jacket

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The band of the Astrum Beret

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Simple, elegant and useful, give it a go.