tokens: Now , if you want to create an adjacency matrix for a graph containing n vertices , simply create a 2D array of size n x n and initialize all of the elements in it with 0 .
ner_tags: O O O O O O O O O B-Data_Structure O O B-Data_Structure O B-Variable O O O O O O B-Data_Structure O O B-Variable O B-Variable O O O O O O O O O B-Value O