token - Using bigram using Stanford NLP in java -

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i using stanford nlp api document collection , code used tokenization 

              ptbtokenizer<corelabel> ptbt = new ptbtokenizer<>(reader,                                   new corelabeltokenfactory(), "");                                 while (ptbt.hasnext()) {                             corelabel token = ptbt.next();                             string word = token.get(textannotation.class);                            }

this code delimited on white space. mean convert words alarm activated in 2 words alarm , activated. guess bigram solve problem not sure how use here. can body suggest thing use bigram ptbtokenizer or how use bigram in tokenization using stanford nlp.


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