This pattern can be adapted to circular knitting by knitting all the odd numbered rows.
Repeat rows 1 - 4.
Row #SideBegin RowRepeatRepeat From *End Row
1W*purl* 
2Rk1*(yo, ssk) twice, k1, (k2 tog, yo) twice, k1 * 
3W*purl* 
4RK2*yo, ssk, yo, sl 2 knitwise-k1-p2sso, yo, k2 tog, yo, k3*k2