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<b>let </b><font color="Maroon" title="c2">x</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of <font color="Maroon" title="c1">O</font>;<br/>

<b>thus </b><a NAME="E1:58_1_1"/>
<font color="Maroon" title="c2">x</font> is <a href="ordinal1.html#V3" title="ORDINAL1:attr.3">ordinal</a>
 ;<br/>


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