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// Code%option noyywrap yylineno c++%{        #include <iostream>%}%%"<"[A-Za-z]*">" { std::cout << YYText(); }%%int main () {    yylex();    return 0;}// Execution$ flex test.l$ gcc -o test lex.yy.cc test.l: In function 'int main()':test.l:10: error: 'yylex' was not declared in this scope