tokens: Note that the eof() function does n't return true if the next call to get will fail because of the end of file being reached - it returns true if the previous call to get failed because of the end of file being reached .
ner_tags: O O O B-Function O O O O B-Value O O O O O B-Function O O O O O O O O O O O O O B-Value O O O O O B-Function O O O O O O O O O O