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<b>take </b>
 <a href="xboole_0.html#K1">{}</a> 
;<br/>

<b>thus </b><a NAME="E1:17_1_1"/>
 <a href="xboole_0.html#K1">{}</a>  is <a href="ordinal1.html#V3" target="_self">ordinal</a>
 <b>by </b><i><a class="ref" href="ordinal1.html#D4" target="_self">Def4</a>, <a class="txt" href="ordinal1.html#E18"><i><font color="Green">Lemma8</font></i></a></i>;<br/>


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