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Often, when analyzing the behaviour of systems modelled as context-freelanguages, we wish to know if two languages overlap. To this end, we present aneffective semi-decision procedure for regular separability of context-freelanguages, based on counter-example guided abstraction refinement. We proposetwo refinement methods, one inexpensive but incomplete, and the other completebut more expensive. We provide an experimental evaluation of this procedure,and demonstrate its practicality on a range of verification andlanguage-theoretic instances.

A Complete Refinement Procedure for Regular Separability of Context-Free Languages