Garter Stitch Zigzag

Knitted in a multiple of 6 sts and a 12-row repeat.
Row 1 - RS: * Knit 3, purl 3; rep from * to end.
Row 2 and all wrong side rows: Purl.
Row 3: Purl 1, * knit 3, purl 3; rep from * to last 5 sts, knit 3, purl 2.
Row 5: Purl 2, * knit 3, purl 3; rep from * to last 4 sts, knit 3, purl 1.
Row 7: * Purl 3, knit 3; repeat from * to end.
Row 9: Purl 2, * knit 3, purl 3; rep from * to last 4 sts, knit 3, purl 1.
Row 11: Purl 1, * knit 3, purl 3; rep from * to last 5 sts, knit 3, purl 2.
Row 12: Purl.