tokens: Similarly , newline is ' \n ' , and in the outer if , it looks like you want to check for whitespace ( isspace ( static_cast <unsigned char> ( sentenceCheck.second ) ) ) , rather than comparing for the values .
ner_tags: O O O O B-Value I-Value B-Value O O O O O B-Code_Block O O O O O O O O O O O B-Code_Block I-Code_Block B-Code_Block I-Code_Block I-Code_Block I-Code_Block I-Code_Block I-Code_Block B-Code_Block O O O O O O O O O