Knitted in a multiple 10 sts + 1, and a 10-row repeat.
Row 1 and all wrong side rows: Purl all sts.
Row 2 -RS: * K5, yo, ssk, k3; rep from * to last st, k1.
Row 4: * K3, k2tog, yo, k1, yo, ssk, k2; rep from * to last st, k1.
Row 6: * K2, k2tog, yo, k3, yo, ssk, k1; rep from * to last st, k1.
Row 8: * K1, k2tog, yo, k5, yo, ssk; rep from * to last st, k1.
Row 10: K2tog, yo, k7 * yo, SK2P, yo, k7; repeat from * to last 2 sts, yo, ssk.
Knitting abbreviations
K, P: Knit, purl | Yo: Yarn over | K2tog: Knit 2 sts together | SSK: Slip slip knit.
SK2P: Slip stitch as if to knit, knit 2 sts together, pass slipped stitch over.