So, start from underneath (1) (with a knot, as usual)
and come up and back down one stitch length (2). Now,
instead of coming up far away, like in the backstitch,
you come right up in the middle of the stitch you just
made, splitting the threads, hence, the split stitch
(3). Go back down again the same stitch length, (4) and
repeat the process!
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