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<b>set </b><font color="Maroon" title="c2">H</font> =  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> ;<br/>
<a NAME="E1:15_1_1"/>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="zfmisc_1.html#K1" title="ZFMISC_1:func.1">bool</a> <font color="Maroon" title="c1">Y</font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T2" title="XBOOLE_1:th.2">XBOOLE_1:2</a></i>;<br/>
<b>then reconsider </b><font color="Maroon" title="c3">H'</font> =  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  as   <a href="setfam_1.html#NM1" title="SETFAM_1:NM.1">Subset-Family</a> of <font color="Maroon" title="c1">Y</font> ;<br/>
<b>take </b>
<font color="Maroon" title="c3">H'</font>
;<br/>

<b>thus </b><a NAME="E3:15_1_1"/>
<font color="Maroon" title="c3">H'</font> is <a href="taxonom2.html#V3" title="TAXONOM2:attr.3">hierarchic</a>
 <b>by </b><i><a class="ref" href="taxonom2.html#T6" target="_self" title="TAXONOM2:th.6">Th6</a></i>;<br/>


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