Knit Purl 4: Ridge Rib

PATTERN
Cast on a multiple of 3 stitches, plus 1.
Row 1 (RS): Knit.
Row 2: Purl.
Row 3: *Knit 1, purl 2, repeat from * to last st, knit 1.
Row 4: *Purl 1, knit 2, repeat from * to last st, purl 1.
Repeat rows 1-4.

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