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<p>and <a href="page.php?w=Ada_%28programming_language%29">Ada</a>. In contrast to these, Oberon emphasizes the use of the <a href="page.php?w=Library_%28computing%29">library</a> concept to extend the language. Enumeration and subrange types, which were present in Modula-2, were omitted, and set types are limited to sets of integers. All imported items must be qualified by the name of the module where they are declared. Low-level facilities are highlighted by only allowing them to be used in a module which includes the identifier <code>SYSTEM</code> in</p><p>
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