How to knit irish moss/seed stitch

Abbreviations: k: knit, p: purl, rep: repeat, sts: stitches

Row 1: k1,p1; rep to end of row

Row 2: k1, p1; rep to end of row

Row 3: p1, k1; rep to end of row

Row 4: p1, k1; rep to end of row

Repeat rows 1-4. For this swatch I cast-on 12 sts and knitted 12 rows or repeated the pattern 3 times.