tokens: I am trying to build appinventor locally on windows 7 using the following document : https://docs.google.com/document/d/1Xc9yt02x3BRoq5m1PJHBr81OOv69rEBy8LVG_84j9jc/pub#h.5p32kqx16c2d
ner_tags: O O O O O B-Application O O B-Operating_System B-Version O O O O O O