ABSTRACT
As we have emphasized several times and as the reader has already seen (and will also see in the next chapters), the idea of putting more grammars to work together is very productive. A lot of variants of grammar systems can be imagined, either suggested by “practical” facts, or being natural from the mathematical point of view. We shall present here some further such variants of CD grammar systems the study of which has been already started, without going into too many details.
