Multiple of 6+5
C: colour; k: Knit; p: Purl; yfwd: yarn forward; sl: slip; ybk: yarn back; rep: repeat; sts: stitches
yarn forward: bring yarn towards you (purl position); sl 1: slip next stitch onto right needle without knitting it; yarn back: put yarn away from you (knit position)
Row 1: C1: k2, *sl 1 purlwise, k5 *, rep from * to * until last 3 sts, sl 1, k2
Row 2: C1: p slipping the sl sts of previous row
Row 3: C2: *k5, sl 1 purlwise* rep from * to * until last 5 sts, k5
Row 4: C2: *k5, yfwd, sl 1 purlwise, ybk* rep from * to * until last 5 sts, k5
These four rows form the pattern.