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<b>reconsider </b><font color="Maroon">S1</font> =  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">Y1</font> as  <a href="waybel_0.html#V1">directed</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">Y1</font> <b>by </b><i><a class="ref" href="waybel_0.html#D6">WAYBEL_0:def 6</a></i>;<br/>
<b>reconsider </b><font color="Maroon">S2</font> =  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">Y2</font> as  <a href="waybel_0.html#V1">directed</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">Y2</font> <b>by </b><i><a class="ref" href="waybel_0.html#D6">WAYBEL_0:def 6</a></i>;<br/>
<a NAME="E3:27_1_1"/>
<span class="p1"><a href="yellow_3.html#K10">[:</a><span class="default"><font color="Maroon">S1</font>,<font color="Maroon">S2</font></span><a href="yellow_3.html#K10">:]</a></span> is <a href="waybel_0.html#V1">directed</a>
 
;<br/>
<a NAME="E4:27_1_1"/><b>then </b>
 <a href="pre_topc.html#K2">[#]</a> <span class="p1"><a href="yellow_3.html#K3">[:</a><span class="default"><font color="Maroon">Y1</font>,<font color="Maroon">Y2</font></span><a href="yellow_3.html#K3">:]</a></span> is <a href="waybel_0.html#V1">directed</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:27_1_1"/>
<span class="p1"><a href="yellow_3.html#K3">[:</a><span class="default"><font color="Maroon">Y1</font>,<font color="Maroon">Y2</font></span><a href="yellow_3.html#K3">:]</a></span> is <a href="waybel_0.html#V7">directed</a>
 <b>by </b><i><a class="ref" href="waybel_0.html#D6">WAYBEL_0:def 6</a></i>;<br/>


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