The Zig-zag lace stitch is a 16 row repeat and is knitted in a multiple of 5 stitches plus 4

The Zig-zag lace stitch is a 16 row repeat and is knitted in a multiple of 5 stitches plus 4

Row 1 (RS): K1, yo, * ssk, k3, yo; repeat from * to last 3 sts, skpo, k1
Row 2 and all wrong side row: Purl all sts.
Row 3: K2, * ssk, k2, yo, k1; repeat from * to last 2 sts, k2
Row 5: K2, * ssk, k1, yo, k2; repeat from * to last 2 sts, k2
Row 7: K2, * ssk, yo, k3; repeat from * to last 2 sts, k2
Row 9: K1, k2tog, * yo, k3, k2tog; repeat from * to last st, yo, k1
Row 11: K2, * k1, yo, k2, k2tog; repeat from * to last 2 sts, k2
Row 13: K2, * k2, yo, k1, k2tog; repeat from * to last 2 sts, k2
Row 15: K2, * k3, yo, k2tog; repeat from * to last 2 sts, k2
Row 16: Purl  

Knitting abbreviations:
Knit: K  |  Purl: P  |  Yarn over: Yo  |  Knit 2 sts together: K2tog  |  Slip slip knit: Ssk.