Anyone aware of good studies on quadriliteral formation in Semitics? Thinking about Hebrew, there seem to be some observable patterns.
E.g., many have r/l as a second letter:
גלמוד = ‘barren’ (جرد = ‘hard’?),
זלעפה = ‘scorching wind’ (root זע׳׳ף?),
גלבוע (name of a mountain, root גב׳׳ע?),…
