private HashMap<String, String> findAmbiguities(
            HashMap<String, Double> posScores, HashMap<String, Double> negScores) {
        HashMap<String, String> ambiguousFeatures = new HashMap<String, String>();
        for(Map.Entry<String, Double> posEntry : posScores.entrySet()) {
            String feature = posEntry.getKey();
            if(negScores.containsKey(feature)) {
                String posNegVal = posEntry.getValue().toString();
                posNegVal += ", " + negScores.get(feature).toString();
                ambiguousFeatures.put(feature, posNegVal);
            }
        }
       
        for(String aFeature : ambiguousFeatures.keySet()) {
            posScores.remove(aFeature);
            negScores.remove(aFeature);
        }
        return ambiguousFeatures;
    }