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<span class="kw">let </span><font color="Maroon" title="c4">x</font> be    <a href="trees_3.html#M3" title="TREES_3:mode.3">Element</a> of <font color="Maroon" title="c3">Tset</font>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> <font color="Maroon" title="c4">x</font> is    <a href="trees_3.html#M5" title="TREES_3:mode.5">Element</a> of <font color="Maroon" title="c2">F</font></span><br/>

<a NAME="E1:4_1_1"/>
<font color="Maroon" title="c4">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c3">Tset</font>
 
;<br/>
<span class="kw">hence </span><a NAME="E2:4_1_1"/>
<font color="Maroon" title="c4">x</font> is    <a href="trees_3.html#M5" title="TREES_3:mode.5">Element</a> of <font color="Maroon" title="c2">F</font>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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