K1 uls: Knit 1 under loose strands.
Insert right-hand needle through the 2 strands from below, then knit next stitch bringing the knit stitch through the loops.

Color A, knitted in a multiple of 6 sts, + 3 and purl one row.
Row 1 – RS: Color B, k2, * sl 5 wyif, k1; rep from * to last st, k1.
Row 2: Color B, p2, * sl 5 wyib, p1; rep from * to last st, p1.
Row 3: Color A, knit.
Row 4: Color A, purl.
Row 5: Color A, k4, * k1 uls, k5; rep from * to last 5 sts, k1 uls, k4.
Row 6: Color A, purl.
Row 7: Color B, k1, sl 3 wyif, k1 *sl 5 wyif, k1; rep from * to last 4 sts, sl 3 wyif, k1.
Row 8: Color B, p1, sl 3 wyib, p1 * sl 5 wyib, p1; rep from * to last 4 sts, sl 3 wyib, p1.
Row 9: Color A, knit.
Row 10: Color A, purl.
Row 11: Color A, k1, * k1 uls, k5; rep from * to last 2 sts, k1 uls, k1.
Row 12: Color A, purl.
Repeat Rows 1 – 12.

Knitting abbreviations:
K, P: Knit, purl | SL: Slip stitch purlwise.
WYIF: With yarn in front | WYIB: With yarn in back.