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<p>code there is a prefix code that has the same code word lengths. <a href="page.php?w=Kraft%27s_inequality">Kraft's inequality</a> characterizes the sets of code word lengths that are possible in a uniquely decodable code.</p>

<p><big>Techniques</big></p>
<p>If every word in the code has the same length, the code is called a <b>fixed-length code</b>, or a <b>block code</b> (though the term <a href="page.php?w=block_code">block code</a> is also used for fixed-size <a href="page.php?w=error-correcting_code">error-correcting code</a>s in <a href="page.php?w=channel_coding">channel coding</a>).</p><p>
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