This book is a direct continuation of (Kornai, 2019), but unlike its predecessor, it is no
longer a textbook. The earlier volume, henceforth abbreviated S19, mostly covered material
that is well known in the field, whereas the current volume is a research monograph,
dominated by the author's own research centering on the 4lang system.
S19 attempted to cater to students of four disciplines, linguistics; computer science;
cognitive science; and philosophy. As Hinrich Sch