tokens: I pulled the birthday data from Facebook and trimmed the year part ( since it may not be available for some users depending on user 's privacy settings ) hence the birthday data is an NSString with date format @ " MM/dd "
ner_tags: O O O O O O B-Website 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 B-Class O O O B-Code_Block I-Code_Block I-Code_Block I-Code_Block