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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be  <a href="margrel1.html#V2">boolean</a>  <a href="hidden.html#M1">set</a> ;<br/>





<b>assume </b><a NAME="E1:24"/><i><font color="Green">E4</font></i>: 
( <font color="Maroon">c<sub>1</sub></font> <a href="bvfunc_1.html#K2">'eqv'</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a>  &amp; <font color="Maroon">c<sub>2</sub></font> <a href="bvfunc_1.html#K2">'eqv'</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a>  )
 ;<br/>

<a NAME="E2:24"/><b>then </b><i><font color="Green">E5</font></i>: 
( <font color="Maroon">c<sub>1</sub></font> <a href="bvfunc_1.html#K1">'imp'</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a>  &amp; <font color="Maroon">c<sub>2</sub></font> <a href="bvfunc_1.html#K1">'imp'</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a>  )
 
<b>by </b><i><a class="ref" href="binari_5.html#T24" target="_self">Th24</a></i>;<br/>
<a NAME="E3:24"/><i><font color="Green">E6</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="bvfunc_1.html#K1">'imp'</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a>  &amp; <font color="Maroon">c<sub>3</sub></font> <a href="bvfunc_1.html#K1">'imp'</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a>  )
 
<b>by </b><i><a class="txt" href="binari_5.html#E1:24"><i><font color="Green">E4</font></i></a>, <a class="ref" href="binari_5.html#T24" target="_self">Th24</a></i>;<br/>
<a NAME="E4:24"/><b>then </b><i><font color="Green">E7</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="bvfunc_1.html#K1">'imp'</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a> 
 
<b>by </b><i><a class="txt" href="binari_5.html#E2:24"><i><font color="Green">E5</font></i></a>, <a class="ref" href="binari_5.html#T26" target="_self">Th26</a></i>;<br/>
<a NAME="E5:24"/>
<font color="Maroon">c<sub>3</sub></font> <a href="bvfunc_1.html#K1">'imp'</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a> 
 
<b>by </b><i><a class="txt" href="binari_5.html#E2:24"><i><font color="Green">E5</font></i></a>, <a class="txt" href="binari_5.html#E3:24"><i><font color="Green">E6</font></i></a>, <a class="ref" href="binari_5.html#T26" target="_self">Th26</a></i>;<br/>
<b>hence </b><a NAME="E6:24"/>
<font color="Maroon">c<sub>1</sub></font> <a href="bvfunc_1.html#K2">'eqv'</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8">TRUE</a> 
 <b>by </b><i><a class="txt" href="binari_5.html#E4:24"><i><font color="Green">E7</font></i></a>, <a class="ref" href="binari_5.html#T24" target="_self">Th24</a></i>;<br/>


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