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<a name="glpk-errors"></a>
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<a name="glpk-errors-1"></a>
<h3 class="subsection">D.4.3 <code>glpk</code> errors</h3>

<p>Possible error messages are
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">&lt;'bad glpk specification'&gt;
</pre></td></tr></table>

<p>which means that the input did not conform to the description given above,
and
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">&lt;'memory overflow'&gt;
</pre></td></tr></table>

<p>It is not considered an exceptional condition for no feasible solution
to exist, and in that case an empty list is returned. 
</p>
<p>The <code>glpk</code> documentation gives no assurance as to the correctness
of reported solutions, so the user should also take the possibility of
incorrect results into account.
</p>
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