  This paper deals with the control generation of right linear grammars with
unknown behaviors (RLUBs, for short) in which derivation behavior is not
determined completely. In particular, we consider a physical property of
control devices used in control systems and formulate it as a partial order
over control alphabet of the control system. We give necessary and sufficient
conditions for given finite language classes to be generated by RLUBs and their
control systems using a given partial order over control alphabet.
