1x1 Ribbing (even number of stitches):
Row 1: *Knit 1, purl 1; repeat to end.
Repeat Row 1 for pattern.
1x1 Ribbing (odd number of stitches):
Row 1 (RS): *Knit 1, purl 1; repeat to last stitch, end k 1.
Row 2 (WS): *Purl 1, knit 1; repeat to last stitch, end p 1.