| dtm2 | Wrappers to DocumentTermMatrix and DocumentTermMatrix to use n-gram tokenizaion | 
| dtmwrappers | Wrappers to DocumentTermMatrix and DocumentTermMatrix to use n-gram tokenizaion | 
| ngramrr | General purpose n-gram tokenizer | 
| tdm2 | Wrappers to DocumentTermMatrix and DocumentTermMatrix to use n-gram tokenizaion |