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<b>take </b>
 <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">L</font>
;<br/>

<b>thus </b><a NAME="E1:66_1_1"/>
( not  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">L</font> is <a href="xboole_0.html#V1">empty</a> &amp;  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">L</font> is <a href="waybel_0.html#V1" target="_self">directed</a> &amp;  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">L</font> is <a href="waybel_0.html#V2" target="_self">filtered</a> &amp;  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">L</font> is <a href="waybel_0.html#V12" target="_self">lower</a> &amp;  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">L</font> is <a href="waybel_0.html#V13" target="_self">upper</a> )
 ;<br/>


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