Another indication of a backward-facing structure
I took another closer look at the y-final tokens to understand the logic behind them. I’m still in REVA mode (EVA in reverse). Basis: eva_z3b, all sections without f57v/f116v, only lines with more than two tokens.
I took all tokens ending in -y with at least three glyphs (I count ckh, cth, cph, cfh, ch, sh, and qo as one glyph each), removed the first and last glyphs, then read the maximum run of e/o at the end of the core, preceded by a d if necessary. This yields 9,191 kerns, 4,022 without a d and 5,169 with a d.
Read from the back, the sequence is always the same: y – d (or not) – o (or not) – e-strokes – base glyph.
The ratio of o to d is interesting. Runs containing an o (usually at the end) have a d in 1,047 out of 1,146 cases—that is, 91 percent. Sequences consisting solely of e’s have a d in 51 percent of cases. The o thus strongly attracts the d, almost doubling its frequency. There is no rule without exception in the VMS; 99 o-sequences appear without a d, but the difference is clear. And the two d-branches are not writing variants of each other: the basic glyphs beneath them are distributed differently.
What strikes me about the diagram is the branching. Read backward, it grows step by step: y is one of a few keys, d is a decision with two outcomes, o/e again two, the e-number three, the basic glyph ten. From the general to the specific. That is the order in which one queries a nested table: for example, first the table, then the half, then the column, then the row. Read forward, the most specific element comes first and the key last.
While this doesn’t prove a writing direction, it does show that the more logical order of the characters runs from the end of the token to the beginning of the token—at least when assuming a structure. One might object that “od” is simply a unit, in which case it would also be unremarkable when read forward. But the issue extends beyond the token boundary:
After “ed y,” the next token begins with “qo” in 38 percent of cases; after “od y,” only in 25 percent, just as after “e y” without “d.” Whether there is an “o” in the “e” sequence therefore depends on how the next word begins.
Read forward, this means: A marker inside a token changes how the next token begins. This needs to be explained. Read backward, it’s simpler: in that case, “qo” precedes the “y” token, and the rule becomes: “qo” is most often followed by “ed,” and less often by “od.” A choice based on what was just written—just as any cipher works.
I know that, statistically speaking, this kind of dependency between neighbors can be described in both directions. The difference lies in the simplicity: In one direction, “depends on the predecessor” is sufficient; in the other, you need “depends on the successor.” A writer knows the predecessor—to know the successor, he must know what comes next.
(And this is now the second strange long-range effect in the E family (a “ch” or ‘sh’ before the E family also affects the number of “qo” in the next token).