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<b>let </b><font color="Maroon">f</font> be  <a href="pencil_1.html#V11" target="_self">TopStruct-yielding</a> <a href="funct_1.html#NM1">Function</a>;<br/>

<b>assume </b><a NAME="E1:31_2_1"/><i><font color="Green">E35</font></i>: 
<font color="Maroon">f</font> is <a href="pencil_1.html#V15" target="_self">PLS-yielding</a>
 ;<br/>

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="pencil_1.html#D15" target="_self">PENCIL_1:def 15</a><br/>

<b>assume </b><a NAME="E2:31_2_1"/>
<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>
 ;<br/>

<b>hence </b><a NAME="E3:31_2_1"/>
<font color="Maroon">x</font> is  non <a href="pencil_1.html#V3" target="_self">void</a>  <a href="pre_topc.html#L1">TopStruct</a> 
 <b>by </b><i>, </i>;<br/>


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