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<h4 class="subsection">6.2.3 Prefix Operator</h4>
<p><a name="index-prefix-operators-256"></a><span class="command">as</span> has the following <dfn>prefix operators</dfn>. They each take
one argument, which must be absolute.
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<dt><code>-</code><dd><dfn>Negation</dfn>. Two's complement negation.
<br><dt><code>~</code><dd><dfn>Complementation</dfn>. Bitwise not.
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