Sample was knit in size 10 cotton on 2mm needles. I suggest a much heavier weight cotton for this afghan stripe, at least fingering weight on 3.25mm needles, if not heavier.
Pattern
In Words
Cast on a multiple of 12sts + 6 extra
1st, 3rd, and 7th rows: P6, *K6, P6, repeat from * to end
2nd, 4th, 6th, and 8th rows: K6, *P6, K6, repeat from * to end
5th row: P6, *C6F, P6, repeat from * to end
Rows 1 -8 form pattern. Repeat for desired length.
Charted
Cast on a multiple of 12sts + 6 extra
Commence from row 1 of chart