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<h4 class="subsection">D.4.2 <code>glpk</code> output</h4>

<p>If a solution meeting the constraints is found, it is returned as a
list of pairs of the form <code>&lt;(</code><var>i</var><code>,</code><var>x</var><code>)...&gt;</code>, where each
<var>i</var> is a natural number and each <var>x</var> is a floating point
number giving the value obtained for the <var>i</var>-th variable numbered
from zero. Any values of <var>i</var> that are omitted from the list
indicate that the corresponding variable has a value of zero.

   <p>If no solution is found due to infeasibility or because <code>glpk</code>
just didn't find one, an empty list is returned. The lack of a
solution is not treated as an exceptional condition.

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