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<a NAME="E1:100_1_1"/>
for <font color="Olive" title="b1">t</font> being   <a href="trees_1.html#M1" title="TREES_1:mode.1">Element</a> of <font color="Maroon" title="c1">T</font>  holds <br/>( <font color="Olive" title="b1">t</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">T</font> or  ex <font color="Olive" title="b2">l</font> being   <a href="trees_3.html#M8" title="TREES_3:mode.8">Leaf</a> of <font color="Maroon" title="c1">T</font> st <font color="Olive" title="b2">l</font> <a href="trees_1.html#NR3" title="TREES_1:NR.3">is_a_proper_prefix_of</a> <font color="Olive" title="b1">t</font> )
 
;<br/>
<a NAME="E2:100_1_1"/><b>then </b>
<font color="Maroon" title="c1">T</font> is    <a href="trees_3.html#M9" title="TREES_3:mode.9">T-Substitution</a> of <font color="Maroon" title="c1">T</font>
 
<b>by </b><i><a class="ref" href="trees_3.html#D14" target="_self" title="TREES_3:def.14">Def14</a></i>;<br/>
<b>hence </b><a NAME="E3:100_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being   <a href="trees_3.html#M9" title="TREES_3:mode.9">T-Substitution</a> of <font color="Maroon" title="c1">T</font> st <font color="Olive">b<sub>1</sub></font> is <a href="finset_1.html#V1" title="FINSET_1:attr.1">finite</a>
 ;<br/>


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