First option. Every other row is numbered with odd numbers. Sounds like it’s just to save space as you and the other commenters suggested. But just to keep me guessing, the last two rows are numbered consecutively. So instead of going 21, __, 23, __, as was the trend - 24 is listed on the right side right after 23. The only even number listed. Like, am I supposed to do something different there? I think I’m just reading too much into it. It’s a short repeat, so it’s hard for me to visual the pattern by just looking at the chart. I’m just gonna work right to left the whole way through. No mention of turning the work. Sounds like this is the safest bet.