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A [aA]
B [bB]
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Z [zZ]

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{B}{E}{G}{I}{N}      return(BEGIN_SYM);
{E}{N}{D}            return(END_SYM);

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ALPHA      [a-zA-Z]
NUM        [0-9]
ALPHANUM   {ALPHA}|{NUM}

%%
{ALPHA}{ALPHANUM}*     return(convert_and_lookup(yytext));

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