I don't know about anyone else, but I tend to see patterns as, well, patterns. In this scarf you have to think of each row in sets of six. You get that from the first 4 rows you knit of the K3, P3 ribbing. Then you note, the deviant row starts on row 5 with a P1, [k3, p3] to last 5 sts, k3, p2.
It's going to go back and forth a bit as you go along. This is just me looking at the pattern, I haven't even tried it yet, but it seems to me to be a back and forth set of 7 alternating types of stitch patterns.
God, I hope this makes sense because it makes perfect sense to me right now as I look at the pattern. Because, you cast on 42 stitches of 7 blocks of six stitches in a K3, P3 ribbing. Then you have a back and forth alternating pattern to create the wave after 4 rows of ribbing.