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<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">f</font> be   <a href="finseq_1.html#NM1">FinSequence</a>;<br/>



<b>assume </b><a NAME="E1:45"/><i><font color="Green">E30</font></i>: 
<font color="Maroon">f</font> <a href="finseq_4.html#R2">just_once_values</a> <font color="Maroon">x</font>
 ;<br/>

<a NAME="E2:45"/><b>then </b><i><font color="Green">E31</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="ref" href="finseq_4.html#T7">FINSEQ_4:7</a></i>;<br/>
<a NAME="E3:45"/><b>then </b><i><font color="Green">E32</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><a href="finseq_5.html#K3">Rev</a> <font color="Maroon">f</font></span>)</span>
 
<b>by </b><i><a class="ref" href="finseq_5.html#T60">FINSEQ_5:60</a></i>;<br/>
<a NAME="E4:45"/>
not <font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="finseq_4.html#K6">-|</a> <font color="Maroon">x</font></span>)</span>
 
<b>by </b><i>, <a class="ref" href="finseq_4.html#T49">FINSEQ_4:49</a></i>;<br/>
<a NAME="E5:45"/><b>then </b>
not <font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><a href="finseq_5.html#K3">Rev</a> <span class="p2">(<span class="default"><font color="Maroon">f</font> <a href="finseq_4.html#K6">-|</a> <font color="Maroon">x</font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="finseq_5.html#T60">FINSEQ_5:60</a></i>;<br/>
<a NAME="E6:45"/><b>then </b>
not <font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="finseq_5.html#K3">Rev</a> <font color="Maroon">f</font></span>)</span> <a href="finseq_4.html#K7">|--</a> <font color="Maroon">x</font></span>)</span>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E7:45"/>
 <a href="finseq_5.html#K3">Rev</a> <font color="Maroon">f</font> <a href="finseq_4.html#R2">just_once_values</a> <font color="Maroon">x</font>
 <b>by </b><i>, <a class="ref" href="finseq_4.html#T60">FINSEQ_4:60</a></i>;<br/>


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