age structure and multidimensional
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<td class="colFirst"><a href="../../../../../org/apache/commons/math3/util/OpenIntToDoubleHashMap.html" title="class in org.apache.commons.math3.util">OpenIntToDoubleHashMap</a></td>
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<div class="block">Open addressed map from int to double.</div>
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<td class="colFirst"><a href="../../../../../org/apache/commons/math3/util/OpenIntToFieldHashMap.html" title="cl