hashMap.put(fields.get(0)+fields.get(1), fields.get(2).equalsIgnoreCase("0") ? false : true);
//preserve existing fields
//compute the features
Feature bagOfWordsFeature = new MostFrequentWordsFeature();
Object[] values = bagOfWordsFeature.getValues(fields, hashMap);
for(int j = 0; j < values.length; j++)
{
try
{
fields.add(values[j].toString());