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+Common-Description:
+ Bison is a general-purpose parser generator that converts an annotated
+ context-free grammar into a deterministic LR or generalized LR (GLR) parser
+ employing LALR(1) parser tables. As an experimental feature, Bison can also
+ generate IELR(1) or canonical LR(1) parser tables. Once you are proficient
+ with Bison, you can use it to develop a wide range of language parsers, from
+ those used in simple desk calculators to complex programming languages.
+ .
+ Bison is upward compatible with Yacc: all properly-written Yacc grammars ought
+ to work with Bison with no change. Anyone familiar with Yacc should be able to
+ use Bison with little trouble. You need to be fluent in C or C++ programming
+ in order to use Bison or to understand this manual. Java is also supported as
+ an experimental feature.