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Context-sensitive

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A Context Sensitive language is a language which can be described in following form

 P -> Q

where the only contstraint being that |P| < |Q|

They have the following properties

They form a subset of recursive language.

I think that whether they are a proper subset is not know as yet.

It is also an open question whether they can be recognised by NPDA's. and 2-NPDA's