Knitted in a multiple of 18 sts and a 4-row repeat.
Row 1- RS: Knit.
Row 2: Purl.
Row 3: * (K2tog) 3 times, (yo, k1) 6 times, (k2tog) 3 times; rep from * to end.
Row 4: Purl.

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