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<p>of pitch classes or <a href="page.php?w=interval_class">interval class</a>es into <a href="page.php?w=integer">whole numbers</a>. Thus if C&nbsp;= 0, then C&nbsp;= 1 ... A&nbsp;= 10, B&nbsp;= 11, with "10" and "11" substituted by "t" and "e" in some sources, A and B in others (like the <a href="page.php?w=duodecimal">duodecimal</a> numeral system, which also uses "t" and "e", or A and B, for "10" and "11"). This allows the most economical presentation of information regarding <a href="page.php?w=post-tonal">post-tonal</a> materials.</p>

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