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  34. <h4 class="subsection">D.4.3 <code>glpk</code> errors</h4>
  35. <p>Possible error messages are
  36. <pre class="example"> &lt;'bad glpk specification'&gt;
  37. </pre>
  38. <p class="noindent">which means that the input did not conform to the description given above,
  39. and
  40. <pre class="example"> &lt;'memory overflow'&gt;
  41. </pre>
  42. <p>It is not considered an exceptional condition for no feasible solution
  43. to exist, and in that case an empty list is returned.
  44. <p>The <code>glpk</code> documentation gives no assurance as to the correctness
  45. of reported solutions, so the user should also take the possibility of
  46. incorrect results into account.
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