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→Level 0: basic definition
It is in fact possible to handle singular/plural issues by using only a Level 2 context-free grammar, but the above rules expressed as a Level 1 context-sensitive grammar are a closer match to ordinary concepts of English grammar (e.g. nouns and verbs must agree in number i.e. singular/plural).
It is in fact possible to handle singular/plural issues by using only a Level 2 context-free grammar, but the above rules expressed as a Level 1 context-sensitive grammar are a closer match to ordinary concepts of English grammar (e.g. nouns and verbs must agree in number i.e. singular/plural).
===Level 0===
===Level 0: recursively enumerable grammar===
A recursively enumerable grammar has absolutely no restriction on what sort of transformation rules can be applied. Rules take the general form:
* [anything] -> [anything]
==References==
==References==