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<b>consider </b><font color="Maroon" title="c4">R</font> being    <a href="pcs_0.html#L1" title="PCS_0:struct.1">TolStr</a> ;<br/>
<b>take </b>
<font color="Maroon" title="c3">I</font> <a href="pre_circ.html#K2" title="PRE_CIRC:func.2">--&gt;</a> <font color="Maroon" title="c4">R</font>
;<br/>

<b>thus </b><a NAME="E2:57_1_1"/>
<font color="Maroon" title="c3">I</font> <a href="pre_circ.html#K2" title="PRE_CIRC:func.2">--&gt;</a> <font color="Maroon" title="c4">R</font> is <a href="pcs_0.html#V7" title="PCS_0:attr.7">TolStr-yielding</a>
 ;<br/>


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