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==Chomsky hierarchy==
==Chomsky hierarchy==
'''Note''': this section is, by necessity, somewhat more technical/formal than the earlier parts of this article. Make sure that you understand the 'Simple example' above before proceeding further, since references will be made to that example to help explain the technicalities.
Chomsky defined 4 grammar levels; level 3 is a subset of level 2, which is a subset of level 1, which is a subset of level 0. The higher the level number, the simpler the generated language is, while the lower the level number the more difficult it is to parse a sentence in that language.
Chomsky defined 4 grammar levels; level 3 is a subset of level 2, which is a subset of level 1, which is a subset of level 0. The higher the level number, the simpler the generated language is, while the lower the level number the more difficult it is to parse a sentence in that language.
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===Level 3===
===Level 3===
==References==
==References==