Mock Rib worked on 21 stitches.(c) Sarah White licensed to About.com, Inc.
Works on an odd number of stitches.
Row one: Knit one, *purl one, knit one. Repeat from * across.
Row two: Purl one, *slip one with yarn in front, purl one. Repeat from * to end.
Repeat these two rows for pattern.
Remember to slip the stitches as if you were purling them.