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* 
2RK2, knit into the next st <strong>in the row below</strong>, then slip the stitch itself onto the right-hand needle, k2 tog, psso*knit into the next stitch <strong>in the row below</strong>, knit the stitch itself, knit again into the row below at left of stitch (3 stitches made from 1), sl 1-k2-tog-psso*knit into the next stitch in the row below, knit the stitch itself, k1
3W*purl* 
4RK1, k2 tog*knit into the next stitch in the row below, knit the stitch itself, knit again into the row below at left of stitch (3 stitches made from 1), sl 1-k2-tog-psso*knit into the next stitch in the row below, knit the stitch itself, knit again into the row below at left of stitch (3 stitches made from 1), sl 1, k1, psso, k1