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Computability and Complexity/Formal Languages/Other Language Classes
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Other Language Classes
The language classes in the ../Chomsky Hierarchy/ do not represent an exhaustive list of the possible language classes. There are many other classes that have been defined since, many of which are defined primarily by a machine that recognizes them, and not by a simple or well-defined grammar.
One example of such a class is the /Counting Languages/.
Note: There should be more examples here.
For a much larger list of language classes, see wikipedia: Complexity class.
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