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<sect2><title>Short descriptions</title>
<para><command>bison</command> generates, from a series of rules, a program
for analyzing the structure of text files. Bison is a replacement for yacc
(Yet Another Compiler Compiler).</para>
<para><command>yacc</command> is a wrapper for bison, meant for programs
that still call yacc instead of bison. It calls bison with the -y option.</para>
<para><command>liby.a</command> is the Yacc library containing
implementations of Yacc-compatible yyerror and main functions. This library
is normally not very useful, but POSIX requires it.</para>
</sect2>
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