See this blog post for more information.
Note: instead of k1 tbl, work a knit full twist: slip 1 as if to purl tbl, slip back to left needle in this configuration, and then knit through the back loop to add a second half twist. This adds a full twist to the stitch instead of the usual half twist made by knitting through the back loop.
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Shown with a cast-on count of 49 stitches.