Send us a comment. RTNs used named subnetworks to generalize FSTNs.
RTNs can represent recursive constructions in natural language.
RTN traversal depends on a pushdown stack.
PTs are to RTNs what FSTs are to FSTNs.
PTs can be used to produce RTN parse trees.
RTNs and PTs are descriptively more powerful than FSTNs and FSTs.
ATNs augment RTNs with registers and register operations.
ATNs are a procedural formalism.
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