Cast on with Color A and purl one row.
Colors A and B.
Repeat rows 1 - 12
Row #SideColorBegin RowRepeatRepeat From *End Row
1WB*purl* 
2RB*knit* 
3WB*purl* 
4RB*knit* 
5WA*knit* 
6RAk1*insert right-hand needle from front under purl loop of stitch 6 rows below next stitch, knit an extra stitch in this stitch; then knit the next stitch on the left-hand needle and pass the extra stitch over it; k7*k1
7WB*purl* 
8RB*knit* 
9WB*purl* 
10RB*knit* 
11WA*knit* 
12RAk5*insert right-hand needle from front under purl loop of stitch 6 rows below next stitch, knit an extra stitch in this stitch; then knit the next stitch on the left-hand needle and pass the extra stitch over it; k7*k5
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