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<b>let </b><font color="Maroon" title="c1">D</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c2">f</font>, <font color="Maroon" title="c3">CR</font>, <font color="Maroon" title="c4">r</font> be    <a href="filerec1.html#NM1" title="FILEREC1:NM.1">File</a> of <font color="Maroon" title="c1">D</font>;<br/>



<b>assume </b><a NAME="E1:45"/>
<font color="Maroon" title="c4">r</font> <a href="filerec1.html#R1" title="FILEREC1:pred.1">is_a_record_of</a> <font color="Maroon" title="c2">f</font>,<font color="Maroon" title="c3">CR</font>
 ;<br/>

<a NAME="E2:45"/><b>then </b>
( <font color="Maroon" title="c4">r</font> <a href="finseq_8.html#NR3" title="FINSEQ_8:NR.3">is_preposition_of</a>  &amp; <font color="Maroon" title="c4">r</font> <a href="finseq_8.html#R5" title="FINSEQ_8:pred.5">is_terminated_by</a> <font color="Maroon" title="c3">CR</font> )
 
<b>by </b><i><a class="ref" href="filerec1.html#D1" target="_self" title="FILEREC1:def.1">Def1</a></i>;<br/>
<a NAME="E3:45"/><b>then </b>
(  <a href="finseq_8.html#K8" title="FINSEQ_8:func.8">addcr</a> <font color="Maroon" title="c4">r</font>,<font color="Maroon" title="c3">CR</font> <a href="finseq_8.html#NR3" title="FINSEQ_8:NR.3">is_preposition_of</a>  &amp; <font color="Maroon" title="c4">r</font> <a href="finseq_8.html#R5" title="FINSEQ_8:pred.5">is_terminated_by</a> <font color="Maroon" title="c3">CR</font> )
 
<b>by </b><i><a class="ref" href="filerec1.html#T29" target="_self" title="FILEREC1:th.29">Th29</a></i>;<br/>
<b>hence </b><a NAME="E4:45"/>
<font color="Maroon" title="c4">r</font> <a href="filerec1.html#R1" title="FILEREC1:pred.1">is_a_record_of</a> <font color="Maroon" title="c4">r</font>,<font color="Maroon" title="c3">CR</font>
 <b>by </b><i><a class="ref" href="filerec1.html#D1" target="_self" title="FILEREC1:def.1">Def1</a></i>;<br/>


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