>
 Use keyphrase frequency statistic.<p>

 -p<br>
 Disallow internal periods.<p>

 -x "length"<br>
 Sets maximum phrase length (default: 3).<p>

 -y "length"<br>
 Sets minimum phrase length (default: 1).<p>

 -o "number"<br>
 The minimum number of times a phrase needs to occur (default: 2). <p>

 -s "name of class implementing list of stop words"<br>
 Sets list of stop words to used (default: StopwordsEnglish).<p>

 -t "name of class implementing stemmer"<br>
 Sets stemmer to use (default: IteratedLovinsSte