internal static IEnumerable <IHashableFeature> CreateFeatures(Pair <NEC, Hla> necAndHla)
 {
     CloseHumanTable();
     Debug.Assert(MaxMaxMismatches != int.MinValue); // real assert
     for (int maxMismatches = 0; maxMismatches <= MaxMaxMismatches; ++maxMismatches)
     {
         if (CloseHuman.IsCloseHuman(necAndHla, maxMismatches))
         {
             CloseHuman featureCloseHuman = CloseHuman.GetInstance(maxMismatches);
             yield return(featureCloseHuman);
         }
     }
 }