public IEnumerable<Bitmap> IteratePartsKNN(IResult res, double dqp, float stddev, float mean, Sequence seq)
 {
     var sym = this.Discretize(dqp, stddev, mean);
     yield return seq.Unravel(sym);
     var left = sym - 1;
     var right = sym + 1;
     bool do_next = true;
     while (do_next) {
         do_next = false;
         var __left = this.Discretize(dqp - res.CoveringRadius, stddev, mean);
         if (0 <= left && __left <= left) {
             yield return seq.Unravel(left);
             --left;
             do_next = true;
         }
         var __right = this.Discretize(dqp + res.CoveringRadius, stddev, mean);
         if (right <= __right && right < seq.Sigma) {
             yield return seq.Unravel(right);
             ++right;
             do_next = true;
         }
         /*Console.WriteLine ("left: {0}, right: {1}, __left: {2}, __right: {3}",
                            left, right, __left, __right);*/
     }
 }