Ah!
Now I understand why the 5 changed entries are exactly where they are, although how their 'changedness' and varying lengths correspond to the operational verb that thematically applies to each of their positions, escapes me. Can it be that the 'changedness' is simply and only to distinguish them from all the other entries in non-thematic positions? And that the operational verb isn't symbolised, and only the root values of the positions matter?
Or am I missing something subtle (as usual)?