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<b>let </b><font color="Maroon">A</font> be    <a href="struct_0.html#L1">1-sorted</a> , <font color="Maroon">B</font> be    <a href="struct_0.html#L1">1-sorted</a> ;<br/><b>let </b><font color="Maroon">F</font> be   <a href="struct_0.html#NM3">Subset-Family</a> of <font color="Maroon">A</font>;<br/><b>let </b><font color="Maroon">G</font> be   <a href="struct_0.html#NM3">Subset-Family</a> of <font color="Maroon">B</font>;<br/>





<b>assume </b><b>that </b><br/><a NAME="E1:5"/><i><font color="Green">E33</font></i>: 
the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">B</font>
 <b>and </b><br/><a NAME="E2:5"/><i><font color="Green">E34</font></i>: 
<font color="Maroon">F</font> <a href="hidden.html#R1">=</a> <font color="Maroon">G</font>
 <b>and </b><br/><a NAME="E3:5"/><i><font color="Green">E35</font></i>: 
<font color="Maroon">F</font> <a href="pre_topc.html#R1">is_a_cover_of</a> <font color="Maroon">A</font>
 ;<br/>

<b>thus </b> <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">B</font> = 
 <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">A</font>
<b>by </b><i/>
<br/>.= 
 <a href="setfam_1.html#K5">union</a> <font color="Maroon">G</font>
<b>by </b><i>, , <a class="ref" href="pre_topc.html#D8">PRE_TOPC:def 8</a></i>
; <i><font color="Red">:: according to </font></i><a class="ref" href="pre_topc.html#D8">PRE_TOPC:def 8</a><br/>


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