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Finite automata are widely used in natural language processing. We present an extension to finite automata, in which atomic symbols are replaced by arbitrary predicates over symbols. Although the extension is fairly trivial for finite state acceptors, the introduction of predicates is more interesting for transducers. Below, we show how various operations on such extended acceptors and transducers can be defined and implemented. But first the extension is motivated as follows.


Noord G.J.M. van