Start with part 1. Finish with a crochet-loop bind-off: *sc 4 sts tog, ch7, sc 3 sts tog, ch7, sc 4 sts tog, ch7, sc 5 sts tog, rep from *.
See also this Ravelry post, and this Ravelry post.
Shown with a cast-on count of 14 stitches.
1 2 3 4 5 Horizontal repeats
1 2 3 4 5 Vertical repeats