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<b>consider </b><font color="Maroon" title="c5">fs1</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> <b> such that </b><br/><a NAME="E2:72_1_1"/><i><font color="Green" title="E45">A1</font></i>: 
<font color="Maroon" title="c5">fs1</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c3">R1</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#D1" title="XBOOLE_0:def.1">XBOOLE_0:def 1</a></i>;<br/>
<b>consider </b><font color="Maroon" title="c6">fs2</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> <b> such that </b><br/><a NAME="E4:72_1_1"/><i><font color="Green" title="E46">A2</font></i>: 
<font color="Maroon" title="c6">fs2</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c4">R2</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#D1" title="XBOOLE_0:def.1">XBOOLE_0:def 1</a></i>;<br/>
<b>reconsider </b><font color="Maroon" title="c7">fs1</font> = <font color="Maroon" title="c5">fs1</font>, <font color="Maroon" title="c8">fs2</font> = <font color="Maroon" title="c6">fs2</font> as   <a href="pnproc_1.html#NM6" title="PNPROC_1:NM.6">firing-sequence</a> of <font color="Maroon" title="c2">N</font> <b>by </b><i><a class="txt" href="#E2:72_1_1"><i><font color="Green" title="E45">A1</font></i></a>, <a class="txt" href="#E4:72_1_1"><i><font color="Green" title="E46">A2</font></i></a></i>;<br/>
<a NAME="E6:72_1_1"/>
<font color="Maroon" title="c7">fs1</font> <a href="lang1.html#K1" title="LANG1:func.1">^</a> <font color="Maroon" title="c8">fs2</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c3">R1</font> <a href="pnproc_1.html#K10" title="PNPROC_1:func.10">before</a> <font color="Maroon" title="c4">R2</font>
 
<b>by </b><i><a class="txt" href="#E2:72_1_1"><i><font color="Green" title="E45">A1</font></i></a>, <a class="txt" href="#E4:72_1_1"><i><font color="Green" title="E46">A2</font></i></a></i>;<br/>
<b>hence </b><a NAME="E7:72_1_1"/>
not <font color="Maroon" title="c3">R1</font> <a href="pnproc_1.html#K10" title="PNPROC_1:func.10">before</a> <font color="Maroon" title="c4">R2</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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