Knitted in a multiple of 3 sts and 4-row repeat.
Row 1 – WS: Purl all sts.
Row 2: K2, * yo, k3 – then pass the first st over the second and third sts; repeat from * to last st, k1.
Row 3: Purl all sts.
Row 4: K1, * k3 – then pass the first st over the second and third sts, yo; repeat from * to last 2 sts, k2.

Knitting abbreviations:
Knit: K | Purl: P | Yarn over: Yo