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<b>reconsider </b><font color="Maroon">B</font> =  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">T</font> as    <a href="connsp_2.html#M1">a_neighborhood</a> of <font color="Maroon">p</font> <b>by </b><i/>;<br/>
<b>take </b>
<font color="Maroon">B</font>
;<br/>

<b>thus </b><a NAME="E2:30_1_1"/>
( not <font color="Maroon">B</font> is <a href="xboole_0.html#V1">empty</a> &amp; <font color="Maroon">B</font> is <a href="pre_topc.html#V3">open</a> )
 ;<br/>


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