This pattern can be adapted to circular knitting by knitting all the even numbered rows.
Repeat Rows 1 - 2.
Row #SideBegin RowRepeatRepeat From *End Row
1Rk1, yo*k3, sl 1-k2-tog-psso, k3, yo, k1, yo*yo, k1
2W*Purl* 
Row: 2  
  Row: 1