Keep the Color B strands loose as they are carried across the front of the fabric.
Cast on with Color A and purl one row.
Colors A and B.
Repeat rows 1 - 12
Row #SideColorBegin RowRepeatRepeat From *End Row
1RBk2*sl 5 wyibf, k1*k1
2WBp2*sl 5 wyib, p1*p1
3RA*Knit * 
4WA*Purl* 
5RAk4*insert needle under the loose Color B strands and knit next stitch, catching both strands behind stitches as it is knitted; k5*insert needle under the loose Color B strands and knit next stitch, catching both strands behind stitches as it is knitted; k4
6WA*Purl* 
7RBk1, sl 3 wyif *k1, sl 5 wyif *k1, sl 3 wyif, k1
8WBp1, sl 3 wyib*p1, sl 5 wyib*p1, sl 5 wyib, p1
9RA*Knit* 
10WA*Purl* 
11RAk1*insert needle under the loose Color B strands and knit next stitch, catching both strands behind stitches as it is knitted; k5 *insert needle under the loose Color B strands and knit next stitch, catching both strands behind stitches as it is knitted; k1
12WA*Purl*