Knitted in a multiple of 3 sts + 1 with Color A.
Preparation row: Color A, knit.
Row 1 – right side: Color B, k3, * sl 1 wyib, k2; rep from * to last st, k1.
Row 2: Color B, k3, * sl 1 wyif, k2; rep from * to last st, k1.
Row 3: Color C, k2, * sl 1 wyib, k2; rep from * to last 2 sts, sl 1 wyib, k1.
Row 4: Color C, k1, * sl 1 wyif, k2; rep from * to end.
Row 5: Color A, k1, * sl 1 wyib, k2; rep from * to end.
Row 6: Color A, k2, * sl 1 wyif, k2; rep from * to last 2 sts, sl 1 wyib, k1.
Repeat Rows 1 – 6.

Knitting abbreviations:
K: Knit | P: Purl | Sl: Slip stitch purlwise
Wyif: With yarn in front | Wyib: With yarn in back.