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2. Context-free grammar - Wikipedia

   en.wikipedia.org/wiki/Context-free_grammar

   A context-free grammar G is defined by the 4-tuple = (,,,), where [a] V is a finite set; each element is called a nonterminal character or a variable. Each variable represents a different type of phrase or clause in the sentence. Variables are also sometimes called syntactic categories.

3. Terminal and nonterminal symbols - Wikipedia

   en.wikipedia.org/wiki/Terminal_and_nonterminal...

   On the other hand, Ψ has two rules that can change it, thus it is nonterminal. A formal language defined or generated by a particular grammar is the set of strings that can be produced by the grammar and that consist only of terminal symbols. Diagram 1 illustrates a string that can be produced with this grammar. Diagram 1.

4. Noncontracting grammar - Wikipedia

   en.wikipedia.org/wiki/Noncontracting_grammar

   A context-sensitive grammar is a noncontracting grammar in which all rules are of the form αAβ → αγβ, where A is a nonterminal, and γ is a nonempty string of nonterminal and/or terminal symbols. However, some authors use the term context-sensitive grammar to refer to noncontracting grammars in general. [1]

5. Simple precedence parser - Wikipedia

   en.wikipedia.org/wiki/Simple_precedence_parser

   Search the table for the relationship between the nonterminal from the production and first symbol in the stack (Starting from top) Push(Stack, relationship) Push(Stack, Non terminal) SearchProductionToReduce (Stack) Find the topmost ⋖ in the stack; this and all the symbols above it are the Pivot.

6. LanguageTool - Wikipedia

   en.wikipedia.org/wiki/LanguageTool

   Grammar checker: License: GNU LGPL v2.1+ ... LanguageTool is a free and open-source grammar, style, and spell checker, and all its features are available for download ...

7. CYK algorithm - Wikipedia

   en.wikipedia.org/wiki/CYK_algorithm

   As pointed out by Lange & Leiß (2009), the drawback of all known transformations into Chomsky normal form is that they can lead to an undesirable bloat in grammar size. The size of a grammar is the sum of the sizes of its production rules, where the size of a rule is one plus the length of its right-hand side.