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In formal language theory, the left corner of a production rule in a context-free grammar is the left-most symbol on the right side of the rule. [1] For example, in the rule A→Xα, X is the left corner. The left corner table associates to a symbol all possible left corners for that symbol, and the left corners of those symbols, etc. Given the ...
In computer science, a left corner parser is a type of chart parser used for parsing context-free grammars.It combines the top-down and bottom-up approaches of parsing. The name derives from the use of the left corner of the grammar's production rules.
An American-style 15×15 crossword grid layout. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one ...
An LL(1) grammar with symbols that have only the empty derivation may or may not be LALR(1). [9] LL grammars cannot have rules containing left recursion. [10] Each LL(k) grammar that is ε-free can be transformed into an equivalent LL(k) grammar in Greibach normal form (which by definition does not have rules with left recursion). [11]
An unsolved Fill-In (left) and a solved one (right) Fill-Ins, also known as Fill-It-Ins or Word Fill-Ins, are a variation of the common crossword puzzle in which words, rather than clues, are given, and the solver must work out where to place them.
The following example demonstrates the common case of parsing a computer language with two levels of grammar: lexical and syntactic. The first stage is the token generation, or lexical analysis, by which the input character stream is split into meaningful symbols defined by a grammar of regular expressions.
Each edition has a sheet of proofreader's marks that appears to be the same apart from the language used to describe the marks. The section cautions that "it should be realised that the typesetter may not understand the language in which the text is written". English; French; German; Italian; etc.
Clues and answers must always match in part of speech, tense, aspect, number, and degree. A plural clue always indicates a plural answer and a clue in the past tense always has an answer in the past tense. A clue containing a comparative or superlative always has an answer in the same degree (e.g., [Most difficult] for TOUGHEST). [6]