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Next, go back into the fabric to the right of the stitching line and at a point diagonally above where your thread first came up. Just make a straight horizontal stitch here.
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Now cross over to the right hand side of your stitch line and go back into the fabric even with where your thread first came up.
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Pull the thread through to the back and then come up - this forms a loose x shape. Come up again on the left side, directly below the spot your thread first came through.
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Now bring the needle under the x shape with out catching any fabric and carefully pull it all the way under the x shape.
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This draws the bottom half of the x together a bit - now go back down into the fabric on the right side below the previous stitch and thats it!
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Just continue these steps and you will make a nice complicated looking line of stitches! 100 Stitches suggested not pulling any of the stitches too tightly. This takes a little practice, if you pull the stitches too tightly, the center braid line will look uneven and wavy.
I used 6 strands of dmc 907. This is stitch #34 and is in the looped stitches section of the 100 Stitches book.