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<<contents of [[before_lines]]>>=
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" /* include own header only in default case: */ \n",
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"#ifndef PPARSE_NAME \n",
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"#include \"Ppparse.h\" \n",
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" /* this is a definition of the yyerror routine */ \n",
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"{ /* ignore error messages by BISON */ \n",
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" /* trick! use s do get around warning `s not used'. */\n",
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" if (1==0) fprintf(stderr, \"%s\", s); \n",