Multiple of 4 + 1
Abbreviations: k: knit; p: purl; rep: repeat; m: make; sl: slip; psso: pass slip stitch over; tog: together
Terms: make 1: put yarn round needle to make a stitch; sl 1: slip the next stitch onto the right needle without knitting it; pass slip stitch over: pass the slip stitch over the stitch just knitted
Row 1: k1, *m1, k3, m1, k1*, rep from * to* until end
Row 2: p
Row 3: k1, *k1, sl 1, k2 tog, psso, k2*, rep from * to * until end
Row 4: p
These 4 rows form the pattern.