Simple lace stitch knitting pattern worked over four rows!

Abbreviations:

k = knit
p = purl
k2tog = knit 2 stitches together.
ssk = slip, slip, knit. Slip two stitches knitwise one at a time onto the right needle, stick point of left needle in two slipped stitches in front of the right needle and knit.
yo = yarn over
p2tog = purl 2 stitches together
p2tog tbl = purl two stitches together into the back loop

 

Cast on multiples of 10 plus 1

Row 1: * p1, k2, k2tog, yo, k1, yo, ssk, k2, * p1

Row 2: k1 * p1, p2tog tbl, yo, p3, yo, p2tog, p1, k1 *

Row 3: * p1, k2tog, yo, k5, yo, ssk, * p1

Row 4: k1, *p9, k1 *