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<p>a computer scientist at <a href="page.php?w=Bell_Labs">Bell Labs</a> / <a href="page.php?w=AT%26T_Corporation">AT&T</a>, developed Yacc because he wanted to insert an <a href="page.php?w=exclusive_or">exclusive or</a> operator into a <a href="page.php?w=B_%28programming_language%29">B language</a> compiler (developed using <a href="page.php?w=Douglas_McIlroy">McIlroy</a>'s <a href="page.php?w=TMG_%28language%29">TMG</a> compiler-compiler), but it turned out to be a hard task. As a result, he was directed by his colleague at Bell Labs <a href="page.php?w=Al_Aho">Al Aho</a></p><p>
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