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<h4 class="subsection">Prefix Operator</h4>



   <p><code>as</code> has the following <dfn>prefix operators</dfn>.  They each take

one argument, which must be absolute.



     <dl>

<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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