protected BigInteger freq(String[] aWords){
  BigInteger total=BigInteger.valueOf(0l);
  for (  NGramModel gram : finder.find(aWords)) {
    total=total.add(BigInteger.valueOf(gram.getFreq()));
  }
  return total;
}

protected BigInteger freq ( String [ ] aWords ) { BigInteger total = BigInteger . valueOf ( 0l ) ; for ( NGramModel gram : finder . find ( aWords ) ) { total = total . add ( BigInteger . valueOf ( gram . getFreq ( ) ) ) ; } return total ; }
returns the frequency for a array of words
