public int getFrequency( Concept synset ) {
		if ( synset.getSynset().equals("0") ) {
			if ( synset.getPos().equals( POS.n ) ) {
				return rootFreqN; 
			} else if ( synset.getPos().equals( POS.v ) ) {
				return rootFreqV;
			}
		}
		int synsetId = synsetToId( synset.getSynset() );
		int freq = 0;
		if ( synset.getPos().equals( POS.n ) ) {
			Integer freqObj = freqN.get( synsetId );
			freq  = freqObj!=null ? freqObj : 0;
		} else if ( synset.getPos().equals( POS.v ) ) {
			Integer freqObj = freqV.get( synsetId );
			freq  = freqObj!=null ? freqObj : 0;
		}
		return freq;
	}