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<a NAME="E1:67_1_1"/>
<font color="Maroon">G</font> <a href="qc_lang2.html#R2">is_subformula_of</a> <font color="Maroon">F</font>
 
<b>by </b><i><a class="ref" href="qc_lang4.html#T12" target="_self">Th12</a></i>;<br/>
<b>hence </b><a NAME="E2:67_1_1"/>
<font color="Maroon">F</font> <a href="qc_lang4.html#K3" target="_self">-entry_points_in_subformula_tree_of</a> <font color="Maroon">G</font> is  non <a href="xboole_0.html#V1">empty</a>  <a href="trees_1.html#M4">AntiChain_of_Prefixes</a> of  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><a href="qc_lang4.html#K2" target="_self">tree_of_subformulae</a> <font color="Maroon">F</font></span>)</span>
 <b>by </b><i/>;<br/>


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