But only Ka2-18 has the typical toa sign (Y), and we can compare it with Bb8-42:

The beginning of the K text is the origin of my colour chart (cfr at gagana). The structure of the week (with the planets as I have coloured them) can be extended to a higher level, and the lever to accomplish it are the toga glyph in the table above.

Therefore this is the place where it should be done, where we ought to use our precious time for an excursion.