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<b>let </b><font color="Maroon">b1</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">SAS</font>, <font color="Maroon">b2</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">SAS</font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:77_1_2"/><i><font color="Green">E31</font></i>: 
 <a href="semi_af1.html#K1" target="_self">sum</a> <font color="Maroon">a</font>,<font color="Maroon">b1</font>,<font color="Maroon">o</font> <a href="hidden.html#R1">=</a> <font color="Maroon">o</font>
 <b>and </b><br/><a NAME="E2:77_1_2"/><i><font color="Green">E32</font></i>: 
 <a href="semi_af1.html#K1" target="_self">sum</a> <font color="Maroon">a</font>,<font color="Maroon">b2</font>,<font color="Maroon">o</font> <a href="hidden.html#R1">=</a> <font color="Maroon">o</font>
 ;<br/>

<a NAME="E3:77_1_2"/>
(  <a href="semi_af1.html#R3" target="_self">congr</a> <font color="Maroon">o</font>,<font color="Maroon">a</font>,<font color="Maroon">b1</font>,<font color="Maroon">o</font> &amp;  <a href="semi_af1.html#R3" target="_self">congr</a> <font color="Maroon">o</font>,<font color="Maroon">a</font>,<font color="Maroon">b2</font>,<font color="Maroon">o</font> )
 
<b>by </b><i><a class="ref" href="semi_af1.html#T41" target="_self">Th41</a>, <a class="ref" href="semi_af1.html#T42" target="_self">Th42</a>, <a class="ref" href="semi_af1.html#T40" target="_self">Th40</a></i>;<br/>
<a NAME="E4:77_1_2"/><b>then </b>
(  <a href="semi_af1.html#R3" target="_self">congr</a> <font color="Maroon">a</font>,<font color="Maroon">o</font>,<font color="Maroon">o</font>,<font color="Maroon">b1</font> &amp;  <a href="semi_af1.html#R3" target="_self">congr</a> <font color="Maroon">a</font>,<font color="Maroon">o</font>,<font color="Maroon">o</font>,<font color="Maroon">b2</font> )
 
<b>by </b><i><a class="ref" href="semi_af1.html#T31" target="_self">Th31</a></i>;<br/>
<b>hence </b><a NAME="E5:77_1_2"/>
<font color="Maroon">b1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b2</font>
 <b>by </b><i><a class="ref" href="semi_af1.html#T25" target="_self">Th25</a></i>;<br/>


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