Experiments with interpretation of the labels. The label otol.

[Searcher]

I'm not advocating any particular proposal here, just wanted to show that possibilities can be many.

Also there is a question: What with such words as ol, or, ot, etc?

One possibility is that ol is something different from tol, i.e. they are semantically unrelated.

I don't mean this.
You wrote:

about prefixes as relational operators, like "otol" meaning something being made over "tol", for example otol = "with tol"

So "o" is such an operator in every VMs word that contains it at the beginning? Therefore I asked what about the words ol, ot, or, etc. Is "o" in them an operator? If not, how to identify words where "o" is a prefix that plays role of a preposition or a conjunction, for example, and where it is just a letter or just a prefix? And... not too many such prefixes / conjunctions / prepositions?
I like more the "bigrams" variant mentioned by you.