Allan - 2014-02-05

I'm new in using maxent.
Today I just used the example of predicting the type of documents.
(just modify something in the example folder)
There are four types of documents and each document has many words.

But it seems that in that example GIS model, it just use the unigram feature to generate the model. But what if I want to use bigram or trigram feature as context. How I can do that?

feature here I think is one word is one feature if using unigram.
But I think if in bigram, it will combine two words as features, right?

Any body can help?