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<b>take </b>
 <a href="pre_topc.html#K1">{}</a> <font color="Maroon">GX</font>
;<br/>

<b>thus </b><a NAME="E1:75_1_1"/>
 <a href="pre_topc.html#K1">{}</a> <font color="Maroon">GX</font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


</div>
