tokens: I 've downloaded all the software listed in section 3 and proceeded building the app inventor by cloning a git repository by running the following git command from a shell : git clone https://github.com/mit-cml/appinventor-sources.git
ner_tags: O O O O O O O O O O O O O O O O O O O B-Application O O O O O B-Application O O O B-Application O B-Code_Block I-Code_Block O