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<h4 class="subsection">D.4.3 <code>glpk</code> errors</h4>

<p>Possible error messages are

<pre class="example">     &lt;'bad glpk specification'&gt;
</pre>
   <p class="noindent">which means that the input did not conform to the description given above,
and

<pre class="example">     &lt;'memory overflow'&gt;
</pre>
   <p>It is not considered an exceptional condition for no feasible solution
to exist, and in that case an empty list is returned.

   <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.

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