<?xml version="1.0"?>
<div class="add">

<a NAME="E1:5_1_1"/>
( ( <font color="Maroon">p</font> <a href="hidden.html#R1">=</a>  <a href="xboolean.html#K1" target="_self">FALSE</a>  or <font color="Maroon">p</font> <a href="hidden.html#R1">=</a>  <a href="xboolean.html#K2" target="_self">TRUE</a>  ) &amp; ( <font color="Maroon">q</font> <a href="hidden.html#R1">=</a>  <a href="xboolean.html#K1" target="_self">FALSE</a>  or <font color="Maroon">q</font> <a href="hidden.html#R1">=</a>  <a href="xboolean.html#K2" target="_self">TRUE</a>  ) )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:5_1_1"/>
<font color="Maroon">p</font> <a href="xboolean.html#K4" target="_self">'&amp;'</a> <font color="Maroon">q</font> is <a href="xboolean.html#V1" target="_self">boolean</a>
 ;<br/>


</div>
