Left Diagonal Rib Knit Purl Pattern

Pattern
Cast on a multiple of 6 sts.
Row 1 (RS): *Purl 2, Knit 4; rep from * to end.
Row 2 (WS): *Purl 4, Knit 2; rep from * to end.
Rows 3-4: rep Rows 1-2.
Row 5: Knit 2, * Purl 2, Knit 4; rep from * to last 4 sts, Purl 2, Knit 2.
Row 6: Purl 2, * Knit 2. Purl 4; rep from * to last 4 sts, Knit 2, Purl 2.
Rows 7: rep Rows 5-6.
Row 9: *Knit 4, Purl 2; rep from * to end.
Row 10: *Knit 2, Purl 4; rep from * to end.
Rows 11-12: rep Row 9-10.
Rep Rows 1-12.