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.