...Vadim, are you not aware that there are quite a number of quadriliteral roots in Hebrew? They are very ancient because many of them e.g. TRGM are shared with Arabic, Aramaic etc.
You wind up then with a language based first on bi-consonantal roots,then tri, then quad.
You still does not explain why more or less "all" roots are triliteral. In
natural-derivation theory, we would expect many quadruples.
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