tokens: You 'll note I 've only required the transaction file - this helps you be aware of what other classes it depends on , because you 'll ( ideally ) stub the constants , or if necessary , require other files .
ner_tags: O O O O O O O O B-File_Name O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O