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<b>consider </b><font color="Maroon">fs1</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E2:72_1_1"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">fs1</font> <a href="hidden.html#R2">in</a> <font color="Maroon">R1</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#D1">XBOOLE_0:def 1</a></i>;<br/>
<b>consider </b><font color="Maroon">fs2</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E4:72_1_1"/><i><font color="Green">E30</font></i>: 
<font color="Maroon">fs2</font> <a href="hidden.html#R2">in</a> <font color="Maroon">R2</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#D1">XBOOLE_0:def 1</a></i>;<br/>
<b>reconsider </b><font color="Maroon">fs1</font> = <font color="Maroon">fs1</font>, <font color="Maroon">fs2</font> = <font color="Maroon">fs2</font> as   <a href="pnproc_1.html#NM5">firing-sequence</a> of <font color="Maroon">N</font> <b>by </b><i>, <a class="ref" href="pnproc_1.html#T6" target="_self">Th6</a></i>;<br/>
<a NAME="E6:72_1_1"/>
<font color="Maroon">fs1</font> <a href="lang1.html#K1">^</a> <font color="Maroon">fs2</font> <a href="hidden.html#R2">in</a> <font color="Maroon">R1</font> <a href="pnproc_1.html#K12" target="_self">before</a> <font color="Maroon">R2</font>
 
<b>by </b><i>, <a class="ref" href="pnproc_1.html#T6" target="_self">Th6</a></i>;<br/>
<b>hence </b><a NAME="E7:72_1_1"/>
not <font color="Maroon">R1</font> <a href="pnproc_1.html#K12" target="_self">before</a> <font color="Maroon">R2</font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


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