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<a NAME="E1:5_1_1"/>
( <font color="Maroon">x</font> <a href="xboolean.html#K5">'or'</a> <font color="Maroon">y</font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7">FALSE</a>  or <font color="Maroon">x</font> <a href="xboolean.html#K5">'or'</a> <font color="Maroon">y</font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a>  )
 
<b>by </b><i><a class="ref" href="xboolean.html#D3">XBOOLEAN:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:5_1_1"/>
<font color="Maroon">x</font> <a href="xboolean.html#K5">'or'</a> <font color="Maroon">y</font> is    <a href="subset_1.html#M1">Element</a> of  <a href="margrel1.html#K6">BOOLEAN</a> 
 ;<br/>


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