This might be of interest, since I’ve been working on this and had just put it together in connection with von Stolfi’s thread.
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The graphic shows how often a “qo” follows each glyph cluster (not token!)
It’s clearly evident that the glyphs k / t and ch / sh before glyphs of the E-family are followed by “qo” with varying frequency before glyphs of the E-family.
The glyphs have, so to speak, a long-range effect.
Another interesting aspect of this graph is that they are always arranged in the same order within their respective groups.
That is, t < k < ch < sh
So t always has the weakest attraction to “qo,” followed by k, ch, and sh, which always have the strongest.